Humans (Homo sapiens) are highly intelligent primates that have become the dominant species on Earth. They are the only extant members of the subtribe Hominina and—together with chimpanzees, gorillas, and orangutans—are part of the family Hominidae (the great apes, or hominids). Humans are terrestrial animals, characterized by their erect posture and bipedal locomotion; high manual dexterity and heavy tool use compared to other animals; open-ended and complex language use compared to other animal communications; larger, more complex brains than other primates; and highly advanced and organized societies.
|An adult human male (left) and female (right) from the Akha tribe in Northern Thailand|
|Homo sapiens population density|
Several early hominins used fire and occupied much of Eurasia. Homo sapiens (sometimes also known as "modern humans") are thought to have diverged in Africa from an earlier hominin around 300,000 years ago, with the earliest fossil evidence of Homo sapiens also appearing around 300,000 years ago in Africa. Humans began to exhibit evidence of behavioral modernity at least by about 100,000–70,000 years ago. In several waves of migration, H. sapiens ventured out of Africa and populated most of the world. The spread of the large and increasing population of humans has profoundly affected the biosphere and millions of species worldwide. Advantages that explain this evolutionary success include a larger, well-developed brain, which enables advanced abstract reasoning, language, problem solving, sociality, and culture through social learning. Humans use tools more frequently and effectively than any other animal: they are the only extant species to build fires, cook food, clothe themselves, and create and use numerous other technologies and arts.
Humans uniquely use systems of symbolic communication as language and art to express themselves and exchange ideas and also organize themselves into purposeful groups. Humans create complex social structures composed of many cooperating and competing groups, from families and kinship networks to political states. Social interactions between humans have established an extremely wide variety of values, social norms, and rituals, which together undergird human society. Curiosity and the human desire to understand and influence the environment and to explain and manipulate phenomena (or events) have motivated humanity's development of science, philosophy, mythology, religion, and other fields of knowledge.
Though most of human existence has been sustained by hunting and gathering in band societies, many human societies transitioned to sedentary agriculture approximately 10,000 years ago, domesticating plants and animals, thus enabling the growth of civilization. These human societies subsequently expanded, establishing various forms of government, religion, and culture around the world, and unifying people within regions to form states and empires. The rapid advancement of scientific and medical understanding in the 19th and 20th centuries permitted the development of fuel-driven technologies and increased lifespans, causing the human population to rise exponentially. The global human population was estimated to be near 7.8 billion in 2019.
Etymology and definition
Although it can be applied to other members of the genus Homo, in common usage the word "human" generally refers to the only extant species — Homo sapiens. The definition of H. sapiens itself is debated. Some paleoanthropologists include fossils that others have allocated to different species, while the majority assign only fossils that align anatomically with the species as it exists today.
The English word "human" is a Middle English loanword from Old French humain, ultimately from Latin hūmānus, the adjectival form of homō ("man"). The native English term man can refer to the species generally (a synonym for humanity) as well as to human males. It may also refer to individuals of either sex, though this latter form is less common in contemporary English.
The species binomial "Homo sapiens" was coined by Carl Linnaeus in his 18th-century work Systema Naturae. The generic name "Homo" is a learned 18th-century derivation from Latin homō, which refers to humans of either sex. The species name "sapiens" means "wise" or "sapient;" "sapiens" is the singular form, so there is no such word as "sapien".
Evolution and range
The genus Homo evolved and diverged from other hominins in Africa several million years ago, after the human clade split from the chimpanzee lineage of the hominids (great apes) branch of the primates. Modern humans, specifically the subspecies Homo sapiens sapiens, proceeded to colonize all the continents and larger islands, arriving in Eurasia 125,000–60,000 years ago, Australia around 40,000 years ago, the Americas around 15,000 years ago, and remote islands such as Hawaii, Easter Island, Madagascar, and New Zealand between the years 300 and 1280.
The closest living relatives of humans are chimpanzees and bonobos (genus Pan), as well as gorillas (genus Gorilla). The gibbons (family Hylobatidae) and orangutans (genus Pongo) were the first groups to split from the lineage leading to humans, then gorillas, and finally, chimpanzees. The splitting date between human and chimpanzee lineages is placed 4–8 million years ago, during the late Miocene epoch. During this split, chromosome 2 was formed from the joining of two other chromosomes, leaving humans with only 23 pairs of chromosomes, compared to 24 for the other apes.
The earliest fossils that have been proposed as members of the hominin lineage are Sahelanthropus tchadensis, dating from ; Orrorin tugenensis, dating from ; and Ardipithecus kadabba, dating to . From these early species, the australopithecines arose around , diverging into robust (Paranthropus) and gracile (Australopithecus) branches, possibly one of which—such as A. garhi, dating to —is a direct ancestor of the genus Homo.
The earliest members of Homo are Homo habilis, which evolved around . H. habilis has been considered the first species for which there is clear evidence of the use of stone tools. Nonetheless, the brains of H. habilis were about the same size as that of a chimpanzee, and their main adaptation was bipedalism. During the next million years a process of encephalization began, and with the arrival of Homo erectus in the fossil record, cranial capacity had doubled. H. erectus were the first of the hominina to leave Africa, between . One population, also sometimes classified as a separate species Homo ergaster, stayed in Africa and evolved into Homo sapiens. It is believed that these species were the first to use fire and complex tools.
The earliest transitional fossils between H. ergaster/erectus and archaic humans are from Africa, such as Homo rhodesiensis, but seemingly transitional forms have also been found in Dmanisi, Georgia. These descendants of H. erectus spread through Eurasia c. 500,000 years ago, evolving into H. antecessor, H. heidelbergensis and H. neanderthalensis. Fossils of anatomically modern humans that date from the Middle Paleolithic (about 200,000 years ago) include the Omo-Kibish I remains of Ethiopia and the fossils of Herto Bouri, Ethiopia. Earlier remains now classified as early Homo sapiens, such as the Jebel Irhoud remains from Morocco and the Florisbad Skull from South Africa, have been dated to about 300,000 and 259,000 years old respectively. Fossil records of archaic Homo sapiens from Skhul in Israel and Southern Europe begin around 90,000 years ago.
Human evolution is characterized by a number of morphological, developmental, physiological, and behavioral changes that have taken place since the split between the last common ancestor of humans and chimpanzees. The most significant of these adaptations are 1. bipedalism, 2. increased brain size, 3. lengthened ontogeny (gestation and infancy), 4. decreased sexual dimorphism (neoteny). The relationship between all these changes is the subject of ongoing debate. Other significant morphological changes included the evolution of a power and precision grip, a change first occurring in H. erectus.
Bipedalism is the basic adaption of the hominin line, and it is considered the main cause behind a suite of skeletal changes shared by all bipedal hominins. The earliest bipedal hominin is considered to be either Sahelanthropus or Orrorin, with Ardipithecus, a full bipedal, coming somewhat later. The knuckle walkers, the gorilla and chimpanzee, diverged around the same time, and either Sahelanthropus or Orrorin may be humans' last shared ancestor with those animals. The early bipedals eventually evolved into the australopithecines and later the genus Homo. There are several theories of the adaptational value of bipedalism. It is possible that bipedalism was favored because it freed up the hands for reaching and carrying food, because it saved energy during locomotion, because it enabled long-distance running and hunting, or as a strategy for avoiding hyperthermia by reducing the surface exposed to direct sun.
The human species developed a much larger brain than that of other primates—typically 1,330 cm3 (81 cu in) in modern humans, over twice the size of that of a chimpanzee or gorilla. The pattern of encephalization started with Homo habilis which at approximately 600 cm3 (37 cu in) had a brain slightly larger than chimpanzees, and continued with Homo erectus (800–1,100 cm3 (49–67 cu in)), and reached a maximum in Neanderthals with an average size of 1,200–1,900 cm3 (73–116 cu in), larger even than Homo sapiens (but less encephalized). The pattern of human postnatal brain growth differs from that of other apes (heterochrony), and allows for extended periods of social learning and language acquisition in juvenile humans. However, the differences between the structure of human brains and those of other apes may be even more significant than differences in size. The increase in volume over time has affected different areas within the brain unequally—the temporal lobes, which contain centers for language processing have increased disproportionately, as has the prefrontal cortex which has been related to complex decision making and moderating social behavior. Encephalization has been tied to an increasing emphasis on meat in the diet, or with the development of cooking, and it has been proposed  that intelligence increased as a response to an increased necessity for solving social problems as human society became more complex.
The reduced degree of sexual dimorphism is primarily visible in the reduction of the male canine tooth relative to other ape species (except gibbons). Another important physiological change related to sexuality in humans was the evolution of hidden estrus. Humans are the only ape in which the female is intermittently fertile year round, and in which no special signals of fertility are produced by the body (such as genital swelling during estrus). Nonetheless humans retain a degree of sexual dimorphism in the distribution of body hair and subcutaneous fat, and in the overall size, males being around 25% larger than females. These changes taken together have been interpreted as a result of an increased emphasis on pair bonding as a possible solution to the requirement for increased parental investment due to the prolonged infancy of offspring.
Rise of Homo sapiens
As early Homo sapiens dispersed, it encountered varieties of archaic humans both in Africa and in Eurasia, in Eurasia notably Homo neanderthalensis. Since 2010, evidence for gene flow between archaic and modern humans during the period of roughly 100,000 to 30,000 years ago has been discovered. This includes modern human admixture in Neanderthals, Neanderthal admixture in all modern humans outside Africa, Denisova hominin admixture in Melanesians as well as admixture from unnamed archaic humans to some Sub-Saharan African populations. The "out of Africa" migration of Homo sapiens took place in at least two waves, the first around 130,000 to 100,000 years ago, the second (Southern Dispersal) around 70,000 to 50,000 years ago, resulting in the colonization of Australia around 65–50,000 years ago, This recent out of Africa migration derived from East African populations, which had become separated from populations migrating to Southern, Central and Western Africa at least 100,000 years earlier. Modern humans subsequently spread globally, replacing archaic humans (either through competition or hybridization). By the beginning of the Upper Paleolithic period (50,000 BP), and likely significantly earlier behavioral modernity, including language, music and other cultural universals had developed. They inhabited Eurasia and Oceania by 40,000 years ago, and the Americas at least 14,500 years ago.
Until about 12,000 years ago (the beginning of the Holocene), all humans lived as hunter-gatherers, generally in small nomadic groups known as band societies, often in caves. The Neolithic Revolution (the invention of agriculture) took place beginning about 10,000 years ago, first in the Fertile Crescent, spreading through large parts of the Old World over the following millennia, and independently in Mesoamerica about 6,000 years ago. Access to food surplus led to the formation of permanent human settlements, the domestication of animals and the use of metal tools for the first time in history.
Agriculture and sedentary lifestyle led to the emergence of early civilizations (the development of urban development, complex society, social stratification and writing) from about 5,000 years ago (the Bronze Age), first beginning in Mesopotamia. The Scientific Revolution, Technological Revolution and the Industrial Revolution brought such discoveries as imaging technology, major innovations in transport, such as the airplane and automobile; energy development, such as coal and electricity. With the advent of the Information Age at the end of the 20th century, modern humans live in a world that has become increasingly globalized and interconnected. Human population growth and industrialisation has led to environmental destruction and pollution significantly contributing to the ongoing mass extinction of other forms of life called the Holocene extinction event, which may be further accelerated by global warming in the future.
Habitat and population
Early human settlements were dependent on proximity to water and—depending on the lifestyle—other natural resources used for subsistence, such as populations of animal prey for hunting and arable land for growing crops and grazing livestock. Modern humans, however, have a great capacity for altering their habitats by means of technology, irrigation, urban planning, construction, deforestation and desertification. Human settlements continue to be vulnerable to natural disasters, especially those placed in hazardous locations and with low quality of construction. Deliberate habitat alteration is often done with the goals of increasing comfort or material wealth, increasing the amount of available food, improving aesthetics, or improving ease of access to resources or other human settlements. With the advent of large-scale trade and transport infrastructure, proximity to these resources has become unnecessary, and in many places, these factors are no longer a driving force behind the success of a population. Nonetheless, the manner in which a habitat is altered is often a major determinant in population change.
The human body's ability to adapt to different environmental stresses allows humans to acclimatize to a wide variety of temperatures, humidity, and altitudes. As a result, humans are a cosmopolitan species found in almost all regions of the world, including tropical rainforest, arid desert, extremely cold arctic regions, and heavily polluted cities. Most other species are confined to a few geographical areas by their limited adaptability. The human population is not, however, uniformly distributed on the Earth's surface, because the population density varies from one region to another and there are large areas almost completely uninhabited, like Antarctica. Most humans (61%) live in Asia; the remainder live in the Americas (14%), Africa (14%), Europe (11%), and Oceania (0.5%).
Within the last century, humans have explored challenging environments such as Antarctica, the deep sea, and outer space. Human habitation within these hostile environments is expensive, typically limited in duration, and restricted to scientific, military, or industrial expeditions. Life in space has been very sporadic, with no more than thirteen humans in space at any given time. Between 1969 and 1972, two humans at a time spent brief intervals on the Moon. As of September 2020, no other celestial body has been visited by humans, although there has been a continuous human presence in space since the initial manning of the International Space Station on 31 October 2000. However, other celestial bodies have been visited by human-made spacecraft.
Since 1800, the human population has increased from one billion to over seven billion. The combined biomass of the carbon of all the humans on Earth in 2018 was estimated at 60 million tons, about 10 times larger than that of all non-domesticated mammals.
In 2004, some 2.5 billion out of 6.3 billion people (39.7%) lived in urban areas. Problems for humans living in cities include various forms of pollution and crime, especially in inner city and suburban slums. Both overall population numbers and the proportion residing in cities are expected to increase significantly in the coming decades.
Humans have had a dramatic effect on the environment. They are apex predators, being rarely preyed upon by other species. Currently, through land development, combustion of fossil fuels, and pollution, humans are thought to be the main contributor to global climate change. If this continues at its current rate, it is predicted that climate change will wipe out half of all plant and animal species over the next century.
Anatomy and physiology
Most aspects of human physiology are closely homologous to corresponding aspects of animal physiology. The human body consists of the legs, the torso, the arms, the neck, and the head. An adult human body consists of about 100 trillion (1014) cells. The most commonly defined body systems in humans are the nervous, the cardiovascular, the circulatory, the digestive, the endocrine, the immune, the integumentary, the lymphatic, the musculoskeletal, the reproductive, the respiratory, and the urinary system.
Humans, like most of the other apes, lack external tails, have several blood type systems, have opposable thumbs, and are sexually dimorphic. The comparatively minor anatomical differences between humans and chimpanzees are largely a result of human bipedalism and larger brain size. One difference is that humans have a far faster and more accurate throw than other animals. Humans are also among the best long-distance runners in the animal kingdom, but slower over short distances. Humans' thinner body hair and more productive sweat glands help avoid heat exhaustion while running for long distances.
As a consequence of bipedalism, human females have narrower birth canals. The construction of the human pelvis differs from other primates, as do the toes. A trade-off for these advantages of the modern human pelvis is that childbirth is more difficult and dangerous than in most mammals, especially given the larger head size of human babies compared to other primates. Human babies must turn around as they pass through the birth canal while other primates do not, which makes humans the only species where females usually require help from their conspecifics (other members of their own species) to reduce the risks of birthing. As a partial evolutionary solution, human fetuses are born less developed and more vulnerable. Chimpanzee babies are cognitively more developed than human babies until the age of six months, when the rapid development of human brains surpasses chimpanzees.
Apart from bipedalism, humans differ from chimpanzees mostly in smelling, hearing, digesting proteins, brain size, and the ability of language. Humans' brains are about three times bigger than in chimpanzees. More importantly, the brain to body ratio is much higher in humans than in chimpanzees, and humans have a significantly more developed cerebral cortex, with a larger number of neurons. The mental abilities of humans are remarkable compared to other apes. Humans' ability of speech is unique among primates. Humans are able to create new and complex ideas, and to develop technology, which is unprecedented among other organisms on Earth.
It is estimated that the worldwide average height for an adult human male is about 171 cm (5 ft 7 in), while the worldwide average height for adult human females is about 159 cm (5 ft 3 in). Shrinkage of stature may begin in middle age in some individuals, but tends to be typical in the extremely aged. Through history human populations have universally become taller, probably as a consequence of better nutrition, healthcare, and living conditions. The average mass of an adult human is 59 kg (130 lb) for females and 77 kg (170 lb) for males. Like many other conditions, body weight and body type is influenced by both genetic susceptibility and environment and varies greatly among individuals. (see obesity)
Humans have a density of hair follicles comparable to other apes. However, human body hair is vellus hair, most of which is so short and wispy as to be practically invisible. In contrast (and unusually among species), a follicle of terminal hair on the human scalp can grow for many years before falling out. Humans have about 2 million sweat glands spread over their entire bodies, many more than chimpanzees, whose sweat glands are scarce and are mainly located on the palm of the hand and on the soles of the feet. Humans have the largest number of eccrine sweat glands among species.
The dental formula of humans is: 188.8.131.52. Humans have proportionately shorter palates and much smaller teeth than other primates. They are the only primates to have short, relatively flush canine teeth. Humans have characteristically crowded teeth, with gaps from lost teeth usually closing up quickly in young individuals. Humans are gradually losing their third molars, with some individuals having them congenitally absent.
Like all animals, humans are a diploid eukaryotic species. Each somatic cell has two sets of 23 chromosomes, each set received from one parent; gametes have only one set of chromosomes, which is a mixture of the two parental sets. Among the 23 pairs of chromosomes there are 22 pairs of autosomes and one pair of sex chromosomes. Like other mammals, humans have an XY sex-determination system, so that females have the sex chromosomes XX and males have XY.
No two humans—not even monozygotic twins—are genetically identical. Genes and environment influence human biological variation in visible characteristics, physiology, disease susceptibility and mental abilities. The exact influence of genes and environment on certain traits is not well understood. Compared to the great apes, human gene sequences—even among African populations—are remarkably homogeneous. On average, genetic similarity between any two humans is 99.5%-99.9%. There is about 2–3 times more genetic diversity within the wild chimpanzee population than in the entire human gene pool.
A rough and incomplete human genome was assembled as an average of a number of humans in 2003, and currently efforts are being made to achieve a sample of the genetic diversity of the species (see International HapMap Project). By present estimates, humans have approximately 22,000 genes. The variation in human DNA is very small compared to other species, possibly suggesting a population bottleneck during the Late Pleistocene (around 100,000 years ago), in which the human population was reduced to a small number of breeding pairs. By comparing mitochondrial DNA, which is inherited only from the mother, geneticists have concluded that the last female common ancestor whose genetic marker is found in all modern humans, the so-called mitochondrial Eve, must have lived around 90,000 to 200,000 years ago.
As with other mammals, human reproduction takes place by internal fertilization via sexual intercourse. Typically the gestation period is 38 weeks (9 months). At this point, most modern cultures recognize the baby as a person entitled to the full protection of the law, though some jurisdictions extend various levels of personhood earlier to human fetuses while they remain in the uterus.
Compared with other species, human childbirth is dangerous. Painful labors lasting 24 hours or more are not uncommon and sometimes lead to the death of the mother, the child or both. This is because of both the relatively large fetal head circumference and the mother's relatively narrow pelvis. The chances of a successful labor increased significantly during the 20th century in wealthier countries with the advent of new medical technologies. In contrast, pregnancy and natural childbirth remain hazardous ordeals in developing regions of the world, with maternal death rates approximately 100 times greater than in developed countries.
In developed countries, infants are typically 3–4 kg (7–9 lb) in weight and 50–60 cm (20–24 in) in height at birth.[failed verification] However, low birth weight is common in developing countries, and contributes to the high levels of infant mortality in these regions. Helpless at birth, humans continue to grow for some years, typically reaching sexual maturity at 12 to 15 years of age. Females continue to develop physically until around the age of 18, whereas male development continues until around age 21.
The human life span can be split into a number of stages: infancy, childhood, adolescence, young adulthood, adulthood and old age. The lengths of these stages, however, have varied across cultures and time periods. Compared to other primates, humans experience an unusually rapid growth spurt during adolescence, where the body grows 25% in size. Chimpanzees, for example, grow only 14%, with no pronounced spurt. The presence of the growth spurt is probably necessary to keep children physically small until they are psychologically mature.
Humans are one of the few species in which females undergo menopause and become infertile decades before the end of their lives. All species of non-human apes are capable of giving birth until death. It has been proposed that menopause increases a woman's overall reproductive success by allowing her to invest more time and resources in her existing offspring, and in turn their children (the grandmother hypothesis), rather than by continuing to bear children into old age.
Evidence-based studies indicate that the life span of an individual depends on two major factors, genetics and lifestyle choices. For various reasons, including biological/genetic causes, women live on average about four years longer than men—as of 2013[update] the global average life expectancy at birth of a girl is estimated at 70.2 years compared to 66.1 for a boy. There are significant geographical variations in human life expectancy, mostly correlated with economic development—for example life expectancy at birth in Hong Kong is 84.8 years for girls and 78.9 for boys, while in Swaziland, primarily because of AIDS, it is 31.3 years for both sexes. The developed world is generally aging, with the median age around 40 years. In the developing world the median age is between 15 and 20 years. While one in five Europeans is 60 years of age or older, only one in twenty Africans is 60 years of age or older. The number of centenarians (humans of age 100 years or older) in the world was estimated by the United Nations at 210,000 in 2002.
Humans are omnivorous, capable of consuming a wide variety of plant and animal material. Human groups have adopted a range of diets from purely vegan to primarily carnivorous. In some cases, dietary restrictions in humans can lead to deficiency diseases; however, stable human groups have adapted to many dietary patterns through both genetic specialization and cultural conventions to use nutritionally balanced food sources. The human diet is prominently reflected in human culture, and has led to the development of food science.
Until the development of agriculture approximately 10,000 years ago, Homo sapiens employed a hunter-gatherer method as their sole means of food collection. This involved combining stationary food sources (such as fruits, grains, tubers, and mushrooms, insect larvae and aquatic mollusks) with wild game, which must be hunted and killed in order to be consumed. It has been proposed that humans have used fire to prepare and cook food since the time of Homo erectus. Around ten thousand years ago, humans developed agriculture, which substantially altered their diet. This change in diet may also have altered human biology; with the spread of dairy farming providing a new and rich source of food, leading to the evolution of the ability to digest lactose in some adults. Agriculture led to increased populations, the development of cities, and because of increased population density, the wider spread of infectious diseases. The types of food consumed, and the way in which they are prepared, have varied widely by time, location, and culture.
In general, humans can survive for two to eight weeks without food, depending on stored body fat. Survival without water is usually limited to three or four days. About 36 million humans die every year from causes directly or indirectly related to starvation. Childhood malnutrition is also common and contributes to the global burden of disease. However global food distribution is not even, and obesity among some human populations has increased rapidly, leading to health complications and increased mortality in some developed, and a few developing countries. Worldwide over one billion people are obese, while in the United States 35% of people are obese, leading to this being described as an "obesity epidemic." Obesity is caused by consuming more calories than are expended, so excessive weight gain is usually caused by an energy-dense diet.
There is biological variation in the human species—with traits such as blood type, genetic diseases, cranial features, facial features, organ systems, eye color, hair color and texture, height and build, and skin color varying across the globe. The typical height of an adult human is between 1.4 and 1.9 m (4 ft 7 in and 6 ft 3 in), although this varies significantly depending on sex, ethnic origin, and family bloodlines. Body size is partly determined by genes and is also significantly influenced by environmental factors such as diet, exercise, and sleep patterns. Adult height for each sex in a particular ethnic group approximately follows a normal distribution.
There is evidence that populations have adapted genetically to various external factors. The genes that allow adult humans to digest lactose are present in high frequencies in populations that have long histories of cattle domestication and are more dependent on cow milk. Sickle cell anemia, which may provide increased resistance to malaria, is frequent in populations where malaria is endemic. Similarly, populations that have for a long time inhabited specific climates, such as arctic or tropical regions or high altitudes, tend to have developed specific phenotypes that are beneficial for conserving energy in those environments—short stature and stocky build in cold regions, tall and lanky in hot regions, and with high lung capacities at high altitudes. Some populations have evolved highly unique adaptations to very specific environmental conditions, such as those advantageous to ocean-dwelling lifestyles and freediving in the Bajau. Skin color tends to vary clinally and general correlates with the level of ultraviolet radiation in a particular geographic area, with darker skin mostly around the equator.
Human skin color can range from darkest brown to lightest peach, or even nearly white or colorless in cases of albinism. Human hair ranges in color from white to red to blond to brown to black, which is the most frequent. Hair color depends on the amount of melanin, with concentrations fading with increased age, leading to grey or even white hair. Most researchers believe that skin darkening is an adaptation that evolved as protection against ultraviolet solar radiation. Light skin pigmentation protects against depletion of vitamin D, which requires sunlight to make. Human skin also has a capacity to darken (tan) in response to exposure to ultraviolet radiation.
There is relatively little variation between human geographical populations, and most of the variation that occurs is at the individual level. Of the 0.1%-0.5% of human genetic differentiation, 85% exists within any randomly chosen local population. Genetic data shows that no matter how population groups are defined, two people from the same population group are almost as different from each other as two people from any two different population groups. Current genetic research has demonstrated that human populations native to the African continent are the most genetically diverse. Human genetic diversity decreases in native populations with migratory distance from Africa, and this is thought to be the result of bottlenecks during human migration. African populations also harbour the highest number of genetic variants not found in other places of the world.
The greatest degree of genetic variation exists between males and females. While the nucleotide genetic variation of individuals of the same sex across global populations is no greater than 0.1%-0.5%, the genetic difference between males and females is between 1% and 2%. Males on average are 15% heavier and 15 cm (6 in) taller than females. On average, men have about 40–50% more upper body strength and 20–30% more lower body strength than women. Women generally have a higher body fat percentage than men. Women have lighter skin than men of the same population; this has been explained by a higher need for vitamin D in females during pregnancy and lactation. As there are chromosomal differences between females and males, some X and Y chromosome related conditions and disorders only affect either men or women. After allowing for body weight and volume, the male voice is usually an octave deeper than the female voice. Women have a longer life span in almost every population around the world.
Human variation is highly non-concordant: many of the genes do not cluster together and are not inherited together. Skin and hair color are mostly not correlated to height, weight, or athletic ability. Humans do not share the same patterns of variation through geography. Dark-skinned populations that are found in Africa, Australia, and South Asia are not closely related to each other. Individuals with the same morphology do not necessarily cluster with each other by lineage, and a given lineage does not include only individuals with the same trait complex. Due to practices of endogamy, allele frequencies cluster by national, ethnic, cultural and linguistic boundarie. Despite this, genetic boundaries around local populations do not biologically mark off any fully discrete groups of humans. Much of human variation is continuous, often with no clear points of demarcation.
The human brain, the focal point of the central nervous system in humans, controls the peripheral nervous system. In addition to controlling "lower," involuntary, or primarily autonomic activities such as respiration and digestion, it is also the locus of "higher" order functioning such as thought, reasoning, and abstraction. These cognitive processes constitute the mind, and, along with their behavioral consequences, are studied in the field of psychology.
Generally regarded as more capable of these higher order activities, the human brain is believed to be more intelligent in general than that of any other known species. While some non-human species are capable of creating structures and using simple tools—mostly through instinct and mimicry—human technology is vastly more complex, and is constantly evolving and improving through time.
Sleep and dreaming
Humans are generally diurnal. The average sleep requirement is between seven and nine hours per day for an adult and nine to ten hours per day for a child; elderly people usually sleep for six to seven hours. Having less sleep than this is common among humans, even though sleep deprivation can have negative health effects. A sustained restriction of adult sleep to four hours per day has been shown to correlate with changes in physiology and mental state, including reduced memory, fatigue, aggression, and bodily discomfort. During sleep humans dream. In dreaming humans experience sensory images and sounds, in a sequence which the dreamer usually perceives more as an apparent participant than as an observer. Dreaming is stimulated by the pons and mostly occurs during the REM phase of sleep.
Consciousness and thought
The human brain perceives the external world through the senses, and each individual human is influenced greatly by his or her experiences, leading to subjective views of existence and the passage of time. Humans are variously said to possess consciousness, self-awareness, and a mind, which correspond roughly to the mental processes of thought. These are said to possess qualities such as self-awareness, sentience, sapience, and the ability to perceive the relationship between oneself and one's environment. The extent to which the mind constructs or experiences the outer world is a matter of debate, as are the definitions and validity of many of the terms used above.
The physical aspects of the mind and brain, and by extension of the nervous system, are studied in the field of neurology, the more behavioral in the field of psychology, and a sometimes loosely defined area between in the field of psychiatry, which treats mental illness and behavioral disorders. Psychology does not necessarily refer to the brain or nervous system, and can be framed purely in terms of phenomenological or information processing theories of the mind. Increasingly, however, an understanding of brain functions is being included in psychological theory and practice, particularly in areas such as artificial intelligence, neuropsychology, and cognitive neuroscience.
The nature of thought is central to psychology and related fields. Cognitive psychology studies cognition, the mental processes' underlying behavior. It uses information processing as a framework for understanding the mind. Perception, learning, problem solving, memory, attention, language and emotion are all well researched areas as well. Cognitive psychology is associated with a school of thought known as cognitivism, whose adherents argue for an information processing model of mental function, informed by positivism and experimental psychology. Techniques and models from cognitive psychology are widely applied and form the mainstay of psychological theories in many areas of both research and applied psychology. Largely focusing on the development of the human mind through the life span, developmental psychology seeks to understand how people come to perceive, understand, and act within the world and how these processes change as they age. This may focus on intellectual, cognitive, neural, social, or moral development. Psychologists have developed intelligence tests and the concept of intelligence quotient in order to assess the relative intelligence of human beings and study its distribution among population.
Some philosophers divide consciousness into phenomenal consciousness, which is experience itself, and access consciousness, which is the processing of the things in experience. Phenomenal consciousness is the state of being conscious, such as when they say "I am conscious." Access consciousness is being conscious of something in relation to abstract concepts, such as when one says "I am conscious of these words." Various forms of access consciousness include awareness, self-awareness, conscience, stream of consciousness, Husserl's phenomenology, and intentionality. The concept of phenomenal consciousness, in modern history, according to some, is closely related to the concept of qualia. Social psychology links sociology with psychology in their shared study of the nature and causes of human social interaction, with an emphasis on how people think towards each other and how they relate to each other. The behavior and mental processes, both human and non-human, can be described through animal cognition, ethology, evolutionary psychology, and comparative psychology as well. Human ecology is an academic discipline that investigates how humans and human societies interact with both their natural environment and the human social environment.
Motivation and emotion
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Human motivation is not yet wholly understood. From a psychological perspective, Maslow's hierarchy of needs is a well-established theory which can be defined as the process of satisfying certain needs in ascending order of complexity. From a more general, philosophical perspective, human motivation can be defined as a commitment to, or withdrawal from, various goals requiring the application of human ability. Furthermore, incentive and preference are both factors, as are any perceived links between incentives and preferences. Volition may also be involved, in which case willpower is also a factor. Ideally, both motivation and volition ensure the selection, striving for, and realization of goals in an optimal manner, a function beginning in childhood and continuing throughout a lifetime in a process known as socialization.
Happiness, or the state of being happy, is a human emotional condition. The definition of happiness is a common philosophical topic. Some people might define it as the best condition that a human can have—a condition of mental and physical health. Others define it as freedom from want and distress; consciousness of the good order of things; assurance of one's place in the universe or society.
Emotion has a significant influence on, or can even be said to control, human behavior, though historically many cultures and philosophers have for various reasons discouraged allowing this influence to go unchecked. Emotional experiences perceived as pleasant, such as love, admiration, or joy, contrast with those perceived as unpleasant, like hate, envy, or sorrow. The Stoics believed excessive emotion was harmful, while some Sufi teachers felt certain extreme emotions could yield a conceptual perfection, what is often translated as ecstasy.
In modern scientific thought, certain refined emotions are considered a complex neural trait innate in a variety of domesticated and non-domesticated mammals. These were commonly developed in reaction to superior survival mechanisms and intelligent interaction with each other and the environment; as such, refined emotion is not in all cases as discrete and separate from natural neural function as was once assumed. However, when humans function in civilized tandem, it has been noted that uninhibited acting on extreme emotion can lead to social disorder and crime.
Sexuality and love
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For humans, sexuality has important social functions: it creates physical intimacy, bonds and hierarchies among individuals, besides ensuring biological reproduction. Sexual desire, or libido, is experienced as a bodily urge, often accompanied by strong emotions such as love, ecstasy and jealousy. The significance of sexuality in the human species is reflected in a number of physical features, among them hidden ovulation, the evolution of external scrotum and (among great apes) a relatively large penis suggesting sperm competition in humans, the absence of an os penis, permanent secondary sexual characteristics and the forming of pair bonds based on sexual attraction as a common social structure. Contrary to other primates that often advertise estrus through visible signs, human females do not have distinct or visible signs of ovulation, and they experience sexual desire outside of their fertile periods.
Human choices in acting on sexuality are commonly influenced by social norms, which vary between cultures. Restrictions are often determined by religious beliefs or social customs. People can fall anywhere along a continuous scale of sexual orientation, although most humans are heterosexual. There is considerably more evidence supporting nonsocial, biological causes of sexual orientation than social ones, especially for males. Recent research, including neurology and genetics, suggests that other aspects of human sexuality are biologically influenced as well.
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|Human society statistics|
|World population||7.8 billion|
|Population density||15/km2 (40/sq mi) by total area|
52/km2 (136/sq mi) by land area
|Largest cities||Tokyo, Delhi, Shanghai, Mumbai, São Paulo, Beijing, Mexico City, Osaka, Cairo, New York-Newark, Dhaka, Karachi, Buenos Aires, Kolkata, Istanbul, Chongqing, Lagos, Manila, Guangzhou, Rio de Janeiro, Los Angeles-Long Beach-Santa Ana, Moscow, Kinshasa, Tianjin, Paris, Shenzhen, Jakarta, Bangalore, London, Chennai, Lima|
|Most widely spoken native languages||Chinese, Spanish, English, Hindi, Arabic, Portuguese, Bengali, Russian, Japanese, Javanese, German, Lahnda, Telugu, Marathi, Tamil, French, Vietnamese, Korean, Urdu, Italian, Indonesian, Persian, Turkish, Polish, Oriya, Burmese, Thai|
|Most popular religions||Christianity, Islam, Hinduism, Buddhism, Sikhism, Judaism|
|US$36,356,240 million |
(US$5,797 per capita)
|$51,656,251 million IND|
($8,236 per capita)
Humanity's unprecedented set of intellectual skills were a key factor in the species' eventual technological advancement and concomitant domination of the biosphere. Disregarding extinct hominids, humans are the only animals known to teach generalizable information, innately deploy recursive embedding to generate and communicate complex concepts, engage in the "folk physics" required for competent tool design, or cook food in the wild. Human traits and behaviors that are unusual (though not necessarily unique) among species, include starting fires, phoneme structuring, self-recognition in mirror tests, habitual bipedal walking, and vocal learning. Scholars debate whether humans evolved the unusual trait of natural persistence hunting, and also debate to what extent humans are the only animals with a theory of mind. Humans may, arguably, be the only animals who have episodic memory and who can engage in "mental time travel". Even compared with other social animals, humans have an unusually high degree of flexibility in their facial expressions. Humans are the only animals known to cry emotional tears.
Humans are highly social beings and tend to live in large complex social groups. More than any other creature, humans are capable of using systems of communication for self-expression, the exchange of ideas, and organization, and as such have created complex social structures composed of many cooperating and competing groups. Human groups range from the size of families to nations. Social interactions between humans have established an extremely wide variety[clarification needed] of values, social norms, and rituals, which together form the basis of human society.
While many species communicate, language is unique to humans, a defining feature of humanity, and a cultural universal. Unlike the limited systems of other animals, human language is open—an infinite number of meanings can be produced by combining a limited number of symbols. Human language also has the capacity of displacement, using words to represent things and happenings that are not presently or locally occurring, but reside in the shared imagination of interlocutors. Language differs from other forms of communication in that it is modality independent; the same meanings can be conveyed through different media, auditively in speech, visually by sign language or writing, and even through tactile media such as braille. Language is central to the communication between humans, and to the sense of identity that unites nations, cultures and ethnic groups. The invention of writing systems at least five thousand years ago allowed the preservation of language on material objects, and was a major technological advancement. The science of linguistics describes the structure and function of language and the relationship between languages. There are approximately six thousand different languages currently in use, including sign languages, and many thousands more that are extinct.
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The division of humans into male and female sexes has been marked culturally by a corresponding division of roles, norms, practices, dress, behavior, rights, duties, privileges, status, and power. Cultural differences by gender have often been believed to have arisen naturally out of a division of reproductive labor; the biological fact that women give birth led to their further cultural responsibility for nurturing and caring for children. Gender roles have varied historically, and challenges to predominant gender norms have recurred in many societies. Both the mother and the father provide care for human offspring, in contrast to other primates, where parental care is mostly restricted to mothers.
All human societies organize, recognize and classify types of social relationships based on relations between parents and children (consanguinity), and relations through marriage (affinity). These kinds of relations are generally called kinship relations. In most societies kinship places mutual responsibilities and expectations of solidarity on the individuals that are so related, and those who recognize each other as kinsmen come to form networks through which other social institutions can be regulated. Among the many functions of kinship is the ability to form descent groups, groups of people sharing a common line of descent, which can function as political units such as clans. Another function is the way in which kinship unites families through marriage, forming kinship alliances between groups of wife-takers and wife-givers. Such alliances also often have important political and economical ramifications, and may result in the formation of political organization above the community level. Kinship relations often includes regulations for whom an individual should or shouldn't marry. All societies have rules of incest taboo, according to which marriage between certain kinds of kin relations are prohibited—such rules vary widely between cultures. Some societies also have rules of preferential marriage with certain kin relations, frequently with either cross or parallel cousins. Rules and norms for marriage and social behavior among kinsfolk is often reflected in the systems of kinship terminology in the various languages of the world. In many societies kinship relations can also be formed through forms of co-habitation, adoption, fostering, or companionship, which also tends to create relations of enduring solidarity (nurture kinship).
Humans often form ethnic groups, such groups tend to be larger than kinship networks and be organized around a common identity defined variously in terms of shared ancestry and history, shared cultural norms and language, or shared biological phenotype. Such ideologies of shared characteristics are often perpetuated in the form of powerful, compelling narratives that give legitimacy and continuity to the set of shared values. Ethnic groupings often correspond to some level of political organization such as the band, tribe, city state or nation. Although ethnic groups appear and disappear through history, members of ethnic groups often conceptualize their groups as having histories going back into the deep past. Such ideologies give ethnicity a powerful role in defining social identity and in constructing solidarity between members of an ethno-political unit. This unifying property of ethnicity has been closely tied to the rise of the nation state as the predominant form of political organization in the 19th and 20th centuries.
Society, government, and politics
Society is the system of organizations and institutions arising from interaction between humans. People can be divided into different groups according to their income, wealth, power, reputation and other factors. The structure of social stratification and the degree of social mobility differs, especially between modern and traditional societies. The first forms of human social organization were families living in band societies as hunter-gatherers. The early distribution of political power was determined by the availability of fresh water, fertile soil, and temperate climate of different locations. As farming populations gathered in larger and denser communities, interactions between these different groups increased leading to the development of governance within and between the communities.
Government can be defined as the political means of creating and enforcing laws; typically via a bureaucratic hierarchy. Politics is the process by which decisions are made within groups; this process often involves conflict as well as compromise. Although the term is generally applied to behavior within governments, politics is also observed in all human group interactions, including corporate, academic, and religious institutions. Many different political systems exist, as do many different ways of understanding them, and many definitions overlap. Examples of governments include monarchy, Communist state, military dictatorship, theocracy, and liberal democracy, the last of which is considered dominant today. All of these issues have a direct relationship with economics.
Trade and economics
Trade is the voluntary exchange of goods and services, and is a form of economic activity. A mechanism that allows trade is called a market. Modern traders instead generally negotiate through a medium of exchange, such as money. As a result, buying can be separated from selling, or earning. Because of specialization and division of labor, most people concentrate on a small aspect of manufacturing or service, trading their labor for products. Trade exists between regions because different regions have an absolute or comparative advantage in the production of some tradable commodity, or because different regions' size allows for the benefits of mass production.
Economics is a social science which studies the production, distribution, trade, and consumption of goods and services. Economics focuses on measurable variables, and is broadly divided into two main branches: microeconomics, which deals with individual agents, such as households and businesses, and macroeconomics, which considers the economy as a whole, in which case it considers aggregate supply and demand for money, capital and commodities. Aspects receiving particular attention in economics are resource allocation, production, distribution, trade, and competition. Economic logic is increasingly applied to any problem that involves choice under scarcity or determining economic value.
War is a state of organized armed conflict between states or non-state actors. War is characterized by the use of lethal violence against others—whether between combatants or upon non-combatants—to achieve military goals through force. Lesser, often spontaneous conflicts, such as brawls, riots, revolts, and melees, are not considered to be warfare. Revolutions can be nonviolent or an organized and armed revolution which denotes a state of war. During the 20th century, it is estimated that between 167 and 188 million people died as a result of war. A common definition defines war as a series of military campaigns between at least two opposing sides involving a dispute over sovereignty, territory, resources, religion, or other issues. A war between internal elements of a state is a civil war.
There have been a wide variety of rapidly advancing tactics throughout the history of war, ranging from conventional war to asymmetric warfare to total war and unconventional warfare. Techniques include hand to hand combat, the use of ranged weapons, naval warfare, and, more recently, air support. Military intelligence has often played a key role in determining victory and defeat. Propaganda, which often includes information, slanted opinion and disinformation, plays a key role both in maintaining unity within a warring group and in sowing discord among opponents. In modern warfare, soldiers and combat vehicles are used to control the land, warships the sea, and aircraft the sky. These fields have also overlapped in the forms of marines, paratroopers, aircraft carriers, and surface-to-air missiles, among others. Satellites in low Earth orbit have made outer space a factor in warfare as well through their use for detailed intelligence gathering; however, no known aggressive actions have been taken from space.
Material culture and technology
Stone tools were used by proto-humans at least 2.5 million years ago. The controlled use of fire began around 1.5 million years ago. Since then, humans have made major advances, developing complex technology to create tools to aid their lives and allowing for other advancements in culture. Major leaps in technology include the discovery of agriculture—what is known as the Neolithic Revolution, and the invention of automated machines in the Industrial Revolution.
Archaeology attempts to tell the story of past or lost cultures in part by close examination of the artifacts they produced. Early humans left stone tools, pottery, and jewelry that are particular to various regions and times.
Body modification is the deliberate altering of the human body for any non-medical reason, such as aesthetics, sexual enhancement, a rite of passage, religious reasons, to display group membership or affiliation, to create body art, shock value, or self-expression. In its most broad definition it includes plastic surgery, socially acceptable decoration (e.g. common ear piercing in many societies), and religious rites of passage (e.g. circumcision in a number of cultures).
Philosophy and self-reflection
Philosophy is a discipline or field of study involving the investigation, analysis, and development of ideas at a general, abstract, or fundamental level. It is the discipline searching for a general understanding of reality, reasoning and values. Major fields of philosophy include logic, metaphysics, epistemology, philosophy of mind, and axiology (which includes ethics and aesthetics). Philosophy covers a very wide range of approaches, and is used to refer to a worldview, to a perspective on an issue, or to the positions argued for by a particular philosopher or school of philosophy.
Religion and spirituality
Religion is generally defined as a belief system concerning the supernatural, sacred or divine, and practices, values, institutions and rituals associated with such belief. Some religions also have a moral code. The evolution and the history of the first religions have recently become areas of active scientific investigation. However, in the course of its development, religion has taken on many forms that vary by culture and individual perspective. Some of the chief questions and issues religions are concerned with include life after death (commonly involving belief in an afterlife), the origin of life, the nature of the universe (religious cosmology) and its ultimate fate (eschatology), and what is moral or immoral. A common source for answers to these questions are beliefs in transcendent divine beings such as deities or a singular God, although not all religions are theistic. Spirituality, belief or involvement in matters of the soul or spirit, is one of the many different approaches humans take in trying to answer fundamental questions about humankind's place in the universe, the meaning of life, and the ideal way to live one's life. Though these topics have also been addressed by philosophy, and to some extent by science, spirituality is unique in that it focuses on mystical or supernatural concepts such as karma and God.
Although the exact level of religiosity can be hard to measure, a majority of humans professes some variety of religious or spiritual belief, although many (in some countries a majority) are irreligious. This includes humans who have no religious beliefs or do not identify with any religion. Humanism is a philosophy which seeks to include all of humanity and all issues common to humans; it is usually non-religious. Most religions and spiritual beliefs are clearly distinct from science on both a philosophical and methodological level; the two are not generally considered mutually exclusive and a majority of humans hold a mix of both scientific and religious views. The distinction between philosophy and religion, on the other hand, is at times less clear, and the two are linked in such fields as the philosophy of religion and theology.
Art is a defining characteristics of humans and there is evidence for a relationship between creativity and language. The earliest evidence of art was shell engravings made by Homo erectus 300 000 years before humans evolved. Human art existed at least 75 000 years ago, with jewellery and drawings found in caves in South Africa. There are various hypothesis's as to why humans have adapted to the arts. These include allowing them to better problem solve issues, providing a means to control or influence other humans, encouraging cooperation and contribution within a society or increasing the chance of attracting a potential mate. The use of imagination developed through art, combined with logic may have given early humans an evolutionary advantage.
Evidence of humans engaging in musical activities predates cave art and so far music has been practised by all human cultures. There exists a wide variety of music genres and ethnic musics; with humans musical abilities being related to other abilities, including complex social human behaviours. It has been shown that human brains respond to music by becoming synchronised with the rhythm and beat, a process called entrainment. Dance is also a form of human expression found in all cultures and may have evolved as a way to help early humans communicate. Listening to music and observing dance stimulates the orbitofrontal cortex and other pleasure sensing areas of the brain.
Unlike speaking, reading and writing does not come naturally to humans and must be taught. Still literature has been present before the invention of words and language, with 30 000 year old paintings on walls inside some caves portraying a series of dramatic scenes. The oldest surviving work of great literature is the Epic of Gilgamesh, engraved on ancient Babylonian tablets 4,000 years ago. Beyond simply passing down knowledge the use and sharing of imaginative fiction through stories might have helped develop humans capabilities for communication and increased the likelihood of securing a mate. As well as entertainment, storytelling may also have been used as a way to provide the audience with moral lessons and encourage cooperation.
Another unique aspect of human culture and thought is the development of complex methods for acquiring knowledge through observation, quantification, and verification. The scientific method has been developed to acquire knowledge of the physical world and the rules, processes and principles of which it consists, and combined with mathematics it enables the prediction of complex patterns of causality and consequence. An understanding of mathematics is unique to humans, although other species of animal have some numerical cognition.
All of science can be divided into three major branches, the formal sciences (e.g., logic and mathematics), which are concerned with formal systems, the applied sciences (e.g., engineering, medicine), which are focused on practical applications, and the empirical sciences, which are based on empirical observation and are in turn divided into natural sciences (e.g., physics, chemistry, biology) and social sciences (e.g., psychology, economics, sociology). A pseudoscience is an activity or a teaching which is mistakenly regarded as being scientific by its major proponents.
- Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. ISBN 0-801-88221-4. OCLC 62265494.
- Global Mammal Assessment Team (2008). "Homo sapiens". The IUCN Red List of Threatened Species. 2008: e.T136584A4313662. doi:10.2305/IUCN.UK.2008.RLTS.T136584A4313662.en. Archived from the original on 7 December 2017. Retrieved 12 May 2020.
- Goodman M, Tagle D, Fitch D, Bailey W, Czelusniak J, Koop B, Benson P, Slightom J (1990). "Primate evolution at the DNA level and a classification of hominoids". J Mol Evol. 30 (3): 260–66. Bibcode:1990JMolE..30..260G. doi:10.1007/BF02099995. PMID 2109087. S2CID 2112935.
- "Hominidae Classification". Animal Diversity Web @ UMich. Archived from the original on 5 October 2006. Retrieved 25 September 2006.
- Scerri, Eleanor M. L.; Thomas, Mark G.; Manica, Andrea; Gunz, Philipp; Stock, Jay T.; Stringer, Chris; Grove, Matt; Groucutt, Huw S.; Timmermann, Axel; Rightmire, G. Philip; d’Errico, Francesco (1 August 2018). "Did Our Species Evolve in Subdivided Populations across Africa, and Why Does It Matter?". Trends in Ecology & Evolution. 33 (8): 582–594. doi:10.1016/j.tree.2018.05.005. ISSN 0169-5347. PMC 6092560. PMID 30007846.
- Henshilwood, C. S.; d'Errico, F.; Yates, R.; Jacobs, Z.; Tribolo, C.; Duller, G. A. T.; Mercier, N.; Sealy, J. C.; Valladas, H.; Watts, I.; Wintle, A. G. (2002). "Emergence of modern human behavior: Middle Stone Age engravings from South Africa". Science. 295 (5558): 1278–1280. Bibcode:2002Sci...295.1278H. doi:10.1126/science.1067575. PMID 11786608. S2CID 31169551.
- Backwell L, d'Errico F, Wadley L (2008). "Middle Stone Age bone tools from the Howiesons Poort layers, Sibudu Cave, South Africa". Journal of Archaeological Science. 35 (6): 1566–1580. doi:10.1016/j.jas.2007.11.006.CS1 maint: multiple names: authors list (link)
- McBrearty, Sally; Brooks, Allison (2000). "The revolution that wasn't: a new interpretation of the origin of modern human behavior". Journal of Human Evolution. 39 (5): 453–563. doi:10.1006/jhev.2000.0435. PMID 11102266.
- Henshilwood, Christopher; Marean, Curtis (2003). "The Origin of Modern Human Behavior: Critique of the Models and Their Test Implications". Current Anthropology. 44 (5): 627–651. doi:10.1086/377665. PMID 14971366.
- Brown, Kyle S.; Marean, Curtis W.; Herries, Andy I.R.; Jacobs, Zenobia; Tribolo, Chantal; Braun, David; Roberts, David L.; Meyer, Michael C.; Bernatchez, J. (14 August 2009), "Fire as an Engineering Tool of Early Modern Humans", Science, 325 (5942): 859–862, Bibcode:2009Sci...325..859B, doi:10.1126/science.1175028, PMID 19679810, S2CID 43916405
- McHenry, H.M (2009). "Human Evolution". In Michael Ruse; Joseph Travis (eds.). Evolution: The First Four Billion Years. Cambridge, Massachusetts: The Belknap Press of Harvard University Press. p. 265. ISBN 978-0-674-03175-3.
- Neubauer, Simon; Hublin, Jean-Jacques; Gunz, Philipp (1 January 2018). "The evolution of modern human brain shape". Science Advances. 4 (1): eaao5961. Bibcode:2018SciA....4.5961N. doi:10.1126/sciadv.aao5961. ISSN 2375-2548. PMC 5783678. PMID 29376123.
- Marshall T. Poe A History of Communications: Media and Society from the Evolution of Speech to the Internet. Cambridge: Cambridge University Press, 2011. ISBN 9780521179447
- "Hunting and gathering culture" Archived 16 January 2016 at the Wayback Machine. Encyclopædia Britannica (online). Encyclopædia Britannica Inc., 2016.
- "Neolithic Archived 17 July 2017 at the Wayback Machine." Ancient History Encyclopedia. Ancient History Encyclopedia Limited. 2014.
- "File POP/1-1: Total population (both sexes combined) by major area, region and country, annually for 1950-2100: Medium fertility variant, 2015–2100". World Population Prospects, the 2015 Revision. United Nations Department of Economic and Social Affairs, Population Division, Population Estimates and Projections Section. July 2015. Archived from the original on 28 July 2016. Retrieved 2 October 2016.
- "Homo sapiens | Meaning & Stages of Human Evolution". Encyclopedia Britannica. Retrieved 18 September 2020.
- OED, s.v. "human."
- Merriam-Webster Dictionary, Man, "Definition 2" Archived 22 September 2017 at the Wayback Machine, accessed 14 September 2017
- Spamer, Earle E (29 January 1999). "Know Thyself: Responsible Science and the Lectotype of Homo sapiens Linnaeus, 1758". Proceedings of the Academy of Natural Sciences. 149 (1): 109–14. JSTOR 4065043.
- Porkorny (1959) s.v. "g'hðem" pp. 414–16; "Homo." Dictionary.com Unabridged (v 1.1). Random House, Inc. 23 September 2008. "Homo". Dictionary.com. Archived from the original on 27 September 2008.
- "Homo sapiens Etymology". Online Etymology Dictionary. Archived from the original on 25 July 2015. Retrieved 25 July 2015.
- Tattersall Ian; Schwartz Jeffrey (2009). "Evolution of the Genus Homo". Annual Review of Earth and Planetary Sciences. 37 (1): 67–92. Bibcode:2009AREPS..37...67T. doi:10.1146/annurev.earth.031208.100202.
- Armitage, S. J; Jasim, S. A; Marks, A. E; Parker, A. G; Usik, V. I; Uerpmann, H.-P (2011). "Hints of Earlier Human Exit From Africa". Science. 331 (6016): 453–56. Bibcode:2011Sci...331..453A. doi:10.1126/science.1199113. PMID 21273486. S2CID 20296624. Archived from the original on 27 April 2011. Retrieved 1 May 2011.
- Paul Rincon Humans 'left Africa much earlier' Archived 9 August 2012 at the Wayback Machine BBC News, 27 January 2011
- Lowe, David J. (2008). "Polynesian settlement of New Zealand and the impacts of volcanism on early Maori society: an update" (PDF). University of Waikato. Archived (PDF) from the original on 22 May 2010. Retrieved 29 April 2010.
- Appenzeller Tim (2012). "Human migrations: Eastern odyssey". Nature. 485 (7396): 24–26. Bibcode:2012Natur.485...24A. doi:10.1038/485024a. PMID 22552074.
- Diogo, R.; Molnar, J.; Wood, B. (4 April 2017). "Bonobo anatomy reveals stasis and mosaicism in chimpanzee evolution, and supports bonobos as the most appropriate extant model for the common ancestor of chimpanzees and humans". Scientific Reports. 7 (1): 608. doi:10.1038/s41598-017-00548-3. PMC 5428693. PMID 28377592.
- Prüfer, K.; Munch, K.; Hellmann, I. (13 June 2012). "The bonobo genome compared with the chimpanzee and human genomes". Nature. 486 (1): 527–531. Bibcode:2012Natur.486..527P. doi:10.1038/nature11128. PMC 3498939. PMID 22722832.
- Wood, Bernard; Richmond, Brian G. (2000). "Human evolution: taxonomy and paleobiology". Journal of Anatomy. 197 (1): 19–60. doi:10.1046/j.1469-7580.2000.19710019.x. PMC 1468107. PMID 10999270.
- Ruvolo M (1997). "Genetic Diversity in Hominoid Primates". Annual Review of Anthropology. 26: 515–40. doi:10.1146/annurev.anthro.26.1.515.
- Ruvolo, Maryellen (1997). "Molecular phylogeny of the hominoids: inferences from multiple independent DNA sequence data sets". Molecular Biology and Evolution. 14 (3): 248–65. doi:10.1093/oxfordjournals.molbev.a025761. PMID 9066793.
- Human Chromosome 2 is a fusion of two ancestral chromosomes Archived 9 August 2011 at the Wayback Machine by Alec MacAndrew; accessed 18 May 2006.
- McHenry, Henry M.; Coffing, Katherine (2000). "Australopithecus to Homo: Transformations in Body and Mind". Annual Review of Anthropology. 29: 125–46. doi:10.1146/annurev.anthro.29.1.125.
- Villmoare, Brian; Kimbel, William H.; Seyoum, Chalachew; Campisano, Christopher J.; DiMaggio, Erin N.; Rowan, John; Braun, David R.; Arrowsmith, J. Ramón; Reed, Kaye E. (20 March 2015). "Early Homo at 2.8 Ma from Ledi-Geraru, Afar, Ethiopia". Science. 347 (6228): 1352–55. Bibcode:2015Sci...347.1352V. doi:10.1126/science.aaa1343. PMID 25739410.
- Ghosh, Pallab (4 March 2015). "'First human' discovered in Ethiopia". BBC News. Archived from the original on 4 March 2015.
- Harmand, Sonia; Lewis, Jason E.; Feibel, Craig S.; Lepre, Christopher J.; Prat, Sandrine; Lenoble, Arnaud; Boës, Xavier; Quinn, Rhonda L.; Brenet, Michel; Arroyo, Adrian; Taylor, Nicholas; Clément, Sophie; Daver, Guillaume; Brugal, Jean-Philip; Leakey, Louise; Mortlock, Richard A.; Wright, James D.; Lokorodi, Sammy; Kirwa, Christopher; Kent, Dennis V.; Roche, Hélène (2015). "3.3-million-year-old stone tools from Lomekwi 3, West Turkana, Kenya". Nature. 521 (7552): 310–15. Bibcode:2015Natur.521..310H. doi:10.1038/nature14464. PMID 25993961. S2CID 1207285.
- Hammond, Ashley S.; Royer, Danielle F.; Fleagle, John G. (July 2017). "The Omo-Kibish I pelvis". Journal of Human Evolution. 108: 199–219. doi:10.1016/j.jhevol.2017.04.004. ISSN 1095-8606. PMID 28552208.
- Fleagle, John G.; Brown, Francis H.; McDougall, Ian (17 February 2005). "Stratigraphic placement and age of modern humans from Kibish, Ethiopia". Nature. 433 (7027): 733–736. Bibcode:2005Natur.433..733M. doi:10.1038/nature03258. ISSN 1476-4687. PMID 15716951. S2CID 1454595.
- López, Saioa; van Dorp, Lucy; Hellenthal, Garrett (21 April 2016). "Human Dispersal Out of Africa: A Lasting Debate". Evolutionary Bioinformatics Online. 11 (Suppl 2): 57–68. doi:10.4137/EBO.S33489. ISSN 1176-9343. PMC 4844272. PMID 27127403.
- Stringer, C. (2016). "The origin and evolution of Homo sapiens". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 371 (1698): 20150237. doi:10.1098/rstb.2015.0237. PMC 4920294. PMID 27298468.
- White, Tim D.; Asfaw, B.; DeGusta, D.; Gilbert, H.; Richards, G. D.; Suwa, G.; Howell, F. C. (2003). "Pleistocene Homo sapiens from Middle Awash, Ethiopia". Nature. 423 (6491): 742–47. Bibcode:2003Natur.423..742W. doi:10.1038/nature01669. PMID 12802332. S2CID 4432091.
- Callaway, Ewan (7 June 2017). "Oldest Homo sapiens fossil claim rewrites our species' history". Nature. doi:10.1038/nature.2017.22114. Retrieved 11 June 2017.
- Sample, Ian (7 June 2017). "Oldest Homo sapiens bones ever found shake foundations of the human story". The Guardian. Retrieved 7 June 2017.
- Hublin, Jean-Jacques; Ben-Ncer, Abdelouahed; Bailey, Shara E.; Freidline, Sarah E.; Neubauer, Simon; Skinner, Matthew M.; Bergmann, Inga; Le Cabec, Adeline; Benazzi, Stefano; Harvati, Katerina; Gunz, Philipp (2017). "New fossils from Jebel Irhoud, Morocco and the pan-African origin of Homo sapiens" (PDF). Nature. 546 (7657): 289–292. Bibcode:2017Natur.546..289H. doi:10.1038/nature22336. PMID 28593953.
- Trinkaus, E. (1993). "Femoral neck-shaft angles of the Qafzeh-Skhul early modern humans, and activity levels among immature near eastern Middle Paleolithic hominids". Journal of Human Evolution. 25 (5): 393–416. doi:10.1006/jhev.1993.1058. ISSN 0047-2484. Archived from the original on 4 September 2012.
- Boyd, Robert; Silk, Joan B. (2003). How Humans Evolved. New York City: Norton. ISBN 978-0-393-97854-4.
- Brues, Alice M.; Snow, Clyde C. (1965). Physical Anthropology. Biennial Review of Anthropology. 4. pp. 1–39. ISBN 9780804717465. Archived from the original on 16 April 2016.
- Brunet, Michel; Guy, Franck; Pilbeam, David; Mackaye, Hassane Taisso; Likius, Andossa; Ahounta, Djimdoumalbaye; Beauvilain, Alain; Blondel, Cécile; Bocherens, Hervé; Boisserie, Jean-Renaud; De Bonis, Louis; Coppens, Yves; Dejax, Jean; Denys, Christiane; Duringer, Philippe; Eisenmann, Véra; Fanone, Gongdibé; Fronty, Pierre; Geraads, Denis; Lehmann, Thomas; Lihoreau, Fabrice; Louchart, Antoine; Mahamat, Adoum; Merceron, Gildas; Mouchelin, Guy; Otero, Olga; Campomanes, Pablo Pelaez; De Leon, Marcia Ponce; Rage, Jean-Claude; Sapanet, Michel; Schuster, Mathieu; Sudre, Jean; Tassy, Pascal; Valentin, Xavier; Vignaud, Patrick; Viriot, Laurent; Zazzo, Antoine; Zollikofer, Christoph (2002). "A new hominid from the Upper Miocene of Chad, Central Africa". Nature. 418 (6894): 145–51. Bibcode:2002Natur.418..145B. doi:10.1038/nature00879. PMID 12110880. S2CID 1316969.
- White, Tim D.; Lovejoy, C. Owen; Asfaw, Berhane; Carlson, Joshua P.; Suwa, Gen (April 2015), "Neither chimpanzee nor human, Ardipithecus reveals the surprising ancestry of both", Proceedings of the National Academy of Sciences, 112 (16): 4877–84, Bibcode:2015PNAS..112.4877W, doi:10.1073/pnas.1403659111, PMC 4413341, PMID 25901308.
- P. Thomas Schoenemann (2006). "Evolution of the Size and Functional Areas of the Human Brain". Annu. Rev. Anthropol. 35: 379–406. doi:10.1146/annurev.anthro.35.081705.123210.
- H. neanderthalensis is a widely known but poorly understood hominid ancestor Archived 8 September 2015 at the Wayback Machine. Archaeologyinfo.com. Retrieved on 24 May 2014.
- Park, Min S.; Nguyen, Andrew D.; Aryan, Henry E.; U, Hoi Sang; Levy, Michael L.; Semendeferi, Katerina (2007). "Evolution of the human brain: changing brain size and the fossil record". Neurosurgery. 60 (3): 555–62. doi:10.1227/01.NEU.0000249284.54137.32. PMID 17327801. S2CID 19610624.
- Bruner, Emiliano (2007). "Cranial shape and size variation in human evolution: structural and functional perspectives". Child's Nervous System. 23 (12): 1357–65. doi:10.1007/s00381-007-0434-2. PMID 17680251. S2CID 16163137.
- Potts Richard (2012). "Evolution and Environmental Change in Early Human Prehistory". Annu. Rev. Anthropol. 41: 151–67. doi:10.1146/annurev-anthro-092611-145754.
- Leonard William R.; Snodgrass J. Josh; Robertson Marcia L. (2007). "Effects of Brain Evolution on Human Nutrition and Metabolism". Annu. Rev. Nutr. 27: 311–27. doi:10.1146/annurev.nutr.27.061406.093659. PMID 17439362.
- "Meat-eating was essential for human evolution, says UC Berkeley anthropologist specializing in diet". Berkeley.edu. 14 June 1999. Archived from the original on 30 January 2012. Retrieved 31 January 2012.
- "Meat in the human diet: an anthropological perspective". Thefreelibrary.com. 1 September 2007. Archived from the original on 11 September 2012. Retrieved 31 January 2012.
- Organ, Chris (22 August 2011). "Phylogenetic rate shifts in feeding time during the evolution of Homo". PNAS. 108 (35): 14555–59. Bibcode:2011PNAS..10814555O. doi:10.1073/pnas.1107806108. PMC 3167533. PMID 21873223.
- Dunbar, Robin I.M. (1998). "The Social Brain Hypothesis" (PDF). Evolutionary Anthropology. 6 (5): 178–190. doi:10.1002/(SICI)1520-6505(1998)6:5<178::AID-EVAN5>3.0.CO;2-8. Archived from the original (PDF) on 12 April 2016. Retrieved 8 June 2016.
- Brown, Terence A. (8 April 2010). "Human evolution: Stranger from Siberia". Nature. 464 (7290): 838–39. Bibcode:2010Natur.464..838B. doi:10.1038/464838a. PMID 20376137. S2CID 4320406.
- Reich, David; Patterson, Nick; Kircher, Martin; Delfin, Frederick; Nandineni, Madhusudan R.; Pugach, Irina; Ko, Albert Min-Shan; Ko, Ying-Chin; Jinam, Timothy A.; Phipps, Maude E.; Saitou, Naruya; Wollstein, Andreas; Kayser, Manfred; Pääbo, Svante; Stoneking, Mark (2011). "Denisova Admixture and the First Modern Human Dispersals into Southeast Asia and Oceania". The American Journal of Human Genetics. 89 (4): 516–28. doi:10.1016/j.ajhg.2011.09.005. PMC 3188841. PMID 21944045.Hebsgaard MB, Wiuf C, Gilbert MT, Glenner H, Willerslev E (2007). "Evaluating Neanderthal genetics and phylogeny". J. Mol. Evol. 64 (1): 50–60. Bibcode:2007JMolE..64...50H. CiteSeerX 10.1.1.174.8969. doi:10.1007/s00239-006-0017-y. PMID 17146600. S2CID 2746487.
- Zimmer, Carl (17 March 2016). "Humans Interbred With Hominins on Multiple Occasions, Study Finds". The New York Times. Archived from the original on 17 March 2016. Retrieved 17 March 2016.
- Hammer; et al. (2011). "Genetic evidence for archaic admixture in Africa". Proceedings of the National Academy of Sciences. 108 (37): 15123–15128. Bibcode:2011PNAS..10815123H. doi:10.1073/pnas.1109300108. PMC 3174671. PMID 21896735.
- Posth C, Renaud G, Mittnik M, Drucker DG, Rougier H, Cupillard C, et al. (2016). "Pleistocene Mitochondrial Genomes Suggest a Single Major Dispersal of Non-Africans and a Late Glacial Population Turnover in Europe". Current Biology. 26 (6): 827–833. doi:10.1016/j.cub.2016.01.037. hdl:2440/114930. PMID 26853362. S2CID 140098861.
- Karmin M, Saag L, Vicente M, Wilson Sayres MA, Järve M, Talas UG, et al. (April 2015). "A recent bottleneck of Y chromosome diversity coincides with a global change in culture". Genome Research. 25 (4): 459–66. doi:10.1101/gr.186684.114. PMC 4381518. PMID 25770088.
- Clarkson Chris, Jacobs Zenobia, Marwick Ben, Fullagar Richard, Wallis Lynley, Smith Mike, Roberts Richard G., Hayes Elspeth, Lowe Kelsey, Carah Xavier, Florin S. Anna, McNeil Jessica, Cox Delyth, Arnold Lee J., Hua Quan, Huntley Jillian, Brand Helen E. A., Manne Tiina, Fairbairn Andrew, Shulmeister James, Lyle Lindsey, Salinas Makiah, Page Mara, Connell Kate, Park Gayoung, Norman Kasih, Murphy Tessa, Pardoe Colin (2017). "Human occupation of northern Australia by 65,000 years ago". Nature. 547 (7663): 306–310. Bibcode:2017Natur.547..306C. doi:10.1038/nature22968. hdl:2440/107043. PMID 28726833. S2CID 205257212.CS1 maint: multiple names: authors list (link). St. Fleu, Nicholas (19 July 2017). "Humans First Arrived in Australia 65,000 Years Ago, Study Suggests". New York Times.
- Wood R (2 September 2017). "Comments on the chronology of Madjedbebe". Australian Archaeology. 83 (3): 172–174. doi:10.1080/03122417.2017.1408545. ISSN 0312-2417. S2CID 148777016.
- O'Connell JF, Allen J, Williams MA, Williams AN, Turney CS, Spooner NA, et al. (August 2018). "Homo sapiens first reach Southeast Asia and Sahul?". Proceedings of the National Academy of Sciences of the United States of America. 115 (34): 8482–8490. doi:10.1073/pnas.1808385115. PMC 6112744. PMID 30082377.
- Vigilant; et al. (1991). "African populations and the evolution of human mitochondrial DNA". Science. 253 (5027): 1503–07. Bibcode:1991Sci...253.1503V. doi:10.1126/science.1840702. PMID 1840702.
- Sahle, Y.; Hutchings, W. K.; Braun, D. R.; Sealy, J. C.; Morgan, L. E.; Negash, A.; Atnafu, B. (2013). Petraglia, Michael D (ed.). "Earliest Stone-Tipped Projectiles from the Ethiopian Rift Date to >279,000 Years Ago". PLOS ONE. 8 (11): e78092. Bibcode:2013PLoSO...878092S. doi:10.1371/journal.pone.0078092. PMC 3827237. PMID 24236011.
- Yong, Ed (15 March 2018). "A Cultural Leap at the Dawn of Humanity - New finds from Kenya suggest that humans used long-distance trade networks, sophisticated tools, and symbolic pigments right from the dawn of our species". The Atlantic. Retrieved 15 March 2018.
- Brooks AS, Yellen JE, Potts R, Behrensmeyer AK, Deino AL, Leslie DE, Ambrose SH, Ferguson JR, d'Errico F, Zipkin AM, Whittaker S, Post J, Veatch EG, Foecke K, Clark JB (2018). "Long-distance stone transport and pigment use in the earliest Middle Stone Age". Science. 360 (6384): 90–94. Bibcode:2018Sci...360...90B. doi:10.1126/science.aao2646. PMID 29545508.
- Nowell April (2010). "Defining Behavioral Modernity in the Context of Neandertal and Anatomically Modern Human Populations". Annual Review of Anthropology. 39: 437–52. doi:10.1146/annurev.anthro.012809.105113.
- Francesco d'Errico; Chris B (2011). "Evolution, revolution or saltation scenario for the emergence of modern cultures?". Phil. Trans. R. Soc. B. 366 (1567): 1060–69. doi:10.1098/rstb.2010.0340. PMC 3049097. PMID 21357228.
- Wolman, David (3 April 2008). "Fossil Feces Is Earliest Evidence of N. America Humans". news.nationalgeographic.com. Archived from the original on 21 April 2008. Cite journal requires
- Wood B (1996). "Human evolution". BioEssays. 18 (12): 945–54. doi:10.1002/bies.950181204. PMID 8976151. S2CID 221464189.
- Thomas F. X. Noble; Barry Strauss; Duane Osheim; Kristen Neuschel; Elinor Accamp (2013). Cengage Advantage Books: Western Civilization: Beyond Boundaries. ISBN 9781285661537. Retrieved 11 July 2015.Spielvogel, Jackson (1 January 2014). Western Civilization: Volume A: To 1500. Cenpage Learning. ISBN 9781285982991. Archived from the original on 5 September 2015. Retrieved 11 July 2015.Thornton, Bruce (2002). Greek Ways: How the Greeks Created Western Civilization. San Francisco, CA: Encounter Books. pp. 1–14. ISBN 978-1-893554-57-3.
- "Greatest Engineering Achievements of the 20th Century". greatachievements.org. Archived from the original on 6 April 2015. Retrieved 7 April 2015.
- Pimm, S.; Raven, P.; Peterson, A.; Sekercioglu, C. H.; Ehrlich, P. R. (2006). "Human impacts on the rates of recent, present, and future bird extinctions". Proceedings of the National Academy of Sciences. 103 (29): 10941–46. Bibcode:2006PNAS..10310941P. doi:10.1073/pnas.0604181103. PMC 1544153. PMID 16829570.
*Barnosky AD, Koch PL, Feranec RS, Wing SL, Shabel AB (2004). "Assessing the causes of late Pleistocene extinctions on the continents". Science. 306 (5693): 70–75. Bibcode:2004Sci...306...70B. CiteSeerX 10.1.1.574.332. doi:10.1126/science.1101476. PMID 15459379. S2CID 36156087.
- Lewis, O. T. (2006). "Climate change, species-area curves and the extinction crisis". Philosophical Transactions of the Royal Society B: Biological Sciences. 361 (1465): 163–71. doi:10.1098/rstb.2005.1712. PMC 1831839. PMID 16553315.
- "How People Modify the Environment" (PDF). Westerville City School District. Retrieved 13 March 2019.
- "Natural disasters and the urban poor" (PDF). World Bank. October 2003. Archived (PDF) from the original on 9 August 2017.
- O'Neil, Dennis. "Human Biological Adaptability; Overview". Palomar College. Archived from the original on 6 March 2013. Retrieved 6 January 2013.
- Gammon, Katharine (22 April 2011). "The 10 purest places on Earth". NBC. Archived from the original on 29 June 2017.
- "Population distribution and density". BBC. Archived from the original on 23 June 2017. Retrieved 26 June 2017.
- Bunn SE, Arthington AH (2002). "Basic principles and ecological consequences of altered flow regimes for aquatic biodiversity". Environmental Management. 30 (4): 492–507. doi:10.1007/s00267-002-2737-0. hdl:10072/6758. PMID 12481916. S2CID 25834286.
- Nancy Atkinson (26 March 2009). "Soyuz Rockets to Space; 13 Humans Now in Orbit". Universetoday.com. Archived from the original on 1 January 2011. Retrieved 10 November 2011.
- Kraft, Rachel (11 December 2010). "JSC celebrates ten years of continuous human presence aboard the International Space Station". JSC Features. Johnson Space Center. Archived from the original on 16 February 2012. Retrieved 13 February 2012.
- "Mission to Mars: Mars Science Laboratory Curiosity Rover". Jet Propulsion Laboratory. Archived from the original on 18 August 2015. Retrieved 26 August 2015.
- "Touchdown! Rosetta's Philae probe lands on comet". European Space Agency. 12 November 2014. Archived from the original on 22 August 2015. Retrieved 26 August 2015.
- "NEAR-Shoemaker". NASA. Archived from the original on 26 August 2015. Retrieved 26 August 2015.
- "World's population reaches six billion". BBC News. 5 August 1999. Archived from the original on 15 April 2008. Retrieved 5 February 2008.
- "UN population estimates". Population Division, United Nations. Archived from the original on 7 May 2011. Retrieved 4 July 2013.
- Bar-On, Yinon M.; Phillips, Rob; Milo, Ron (19 June 2018). "The biomass distribution on Earth". Proceedings of the National Academy of Sciences. 115 (25): 6506–11. doi:10.1073/pnas.1711842115. ISSN 0027-8424. PMC 6016768. PMID 29784790.
- Whitehouse, David (19 May 2005). "Half of humanity set to go urban". BBC News. Archived from the original on 24 July 2017.
- [permanent dead link] Urban, Suburban, and Rural Victimization, 1993–98 U.S. Department of Justice, Bureau of Justice Statistics,. Accessed 29 October 2006
- "World Urbanization Prospects, the 2011 Revision". Population Division, United Nations. Archived from the original on 9 July 2013. Retrieved 4 July 2013.
- Scientific American (1998). Evolution and General Intelligence: Three hypotheses on the evolution of general intelligence Archived 13 September 2006 at the Wayback Machine
- "Climate Change 2001: Working Group I: The Scientific Basis". grida.no/. Archived from the original on 1 June 2007. Retrieved 30 May 2007.
- American Association for the Advancement of Science. Foreword Archived 4 March 2008 at the Wayback Machine. AAAS Atlas of Population & Environment.
- Wilson, E.O. (2002). The Future of Life.
- p. 21 Archived 10 November 2015 at the Wayback Machine Inside the human body: using scientific and exponential notation. Author: Greg Roza. Edition: Illustrated. Publisher: The Rosen Publishing Group, 2007. ISBN 1-4042-3362-8, ISBN 978-1-4042-3362-1. Length: 32 pages
- "Human Anatomy". Inner Body. Archived from the original on 5 January 2013. Retrieved 6 January 2013.
- Parker-Pope, Tara (27 October 2009). "The Human Body Is Built for Distance". The New York Times. Archived from the original on 5 November 2015.
- O'Neil, Dennis. "Humans". Primates. Palomar College. Archived from the original on 11 January 2013. Retrieved 6 January 2013.
- John, Brenman. "What is the role of sweating glands in balancing body temperature when running a marathon?". Livestrong.com. Archived from the original on 31 January 2013. Retrieved 6 January 2013.
- Roser, Max; Appel, Cameron; Ritchie, Hannah (8 October 2013). "Human Height". Our World in Data.
- "Senior Citizens Do Shrink – Just One of the Body Changes of Aging". News. Senior Journal. Archived from the original on 19 February 2013. Retrieved 6 January 2013.
- Bogin B, Rios L (September 2003). "Rapid morphological change in living humans: implications for modern human origins". Comparative Biochemistry and Physiology A. 136 (1): 71–84. doi:10.1016/S1095-6433(02)00294-5. PMID 14527631.
- "Human weight". Articleworld.org. Archived from the original on 8 December 2011. Retrieved 10 December 2011.
- "Mass Of An Adult". The Physics Factbook: An Encyclopedia of Scientific Essays. Archived from the original on 1 January 2018. Retrieved 31 December 2017.
- Kushner, Robert (2007). Treatment of the Obese Patient (Contemporary Endocrinology). Totowa, NJ: Humana Press. p. 158. ISBN 978-1-59745-400-1. Retrieved 5 April 2009.
- Adams JP, Murphy PG (2000). "Obesity in anaesthesia and intensive care". British Journal of Anaesthesia. 85 (1): 91–108. doi:10.1093/bja/85.1.91. PMID 10927998.
- "How to be Human: The reason we are so scarily hairy". New Scientist. 2017. Retrieved 29 April 2020.
- Sandel, Aaron A. (September 2013). "Brief communication: Hair density and body mass in mammals and the evolution of human hairlessness". American Journal of Physical Anthropology. 152 (1): 145–150. doi:10.1002/ajpa.22333. hdl:2027.42/99654. PMID 23900811.
- Kirchweger, Gina. "The Biology of Skin Color: Black and White". Evolution: Library. PBS. Archived from the original on 16 February 2013. Retrieved 6 January 2013.
- Collins, Desmond (1976). The Human Revolution: From Ape to Artist. p. 208.
- Therman, Eeva (1980). Human Chromosomes: Structure, Behavior, Effects. Springer US. pp. 112–24. doi:10.1007/978-1-4684-0107-3. ISBN 978-1-4684-0109-7. S2CID 36686283.
- Edwards, JH; T Dent; J Kahn (June 1966). "Monozygotic twins of different sex". Journal of Medical Genetics. 3 (2): 117–23. doi:10.1136/jmg.3.2.117. PMC 1012913. PMID 6007033.
- Machin, GA (January 1996). "Some causes of genotypic and phenotypic discordance in monozygotic twin pairs". American Journal of Medical Genetics. 61 (3): 216–28. doi:10.1002/(SICI)1096-8628(19960122)61:3<216::AID-AJMG5>3.0.CO;2-S. PMID 8741866.
- Race, Ethnicity; Genetics Working Group (2005). "The use of racial, ethnic, and ancestral categories in human genetics research". American Journal of Human Genetics. 77 (4): 519–32. doi:10.1086/491747. PMC 1275602. PMID 16175499.
- Dr. Shafer, Aaron. "Understanding Genetics". The Tech. Stanford University. Archived from the original on 6 September 2013. Retrieved 13 December 2013.
The DNA sequence in your genes is on average 99.9% identical to ANY other human being.
- "Genetic – Understanding Human Genetic Variation". Human Genetic Variation. National Institute of Health (NIH). Archived from the original on 25 August 2013. Retrieved 13 December 2013.
Between any two humans, the amount of genetic variation—biochemical individuality—is about 0.1%.
- "First Individual Diploid Human Genome Published By Researchers at J. Craig Venter Institute". J. Craig Venter Institute. 3 September 2007. Archived from the original on 16 July 2011. Retrieved 5 September 2011.
- Levy S, Sutton G, Ng PC, Feuk L, Halpern AL, Walenz BP, et al. (September 2007). "The diploid genome sequence of an individual human". PLOS Biology. 5 (10): e254. doi:10.1371/journal.pbio.0050254. PMC 1964779. PMID 17803354.
- "Understanding Genetics: Human Health and the Genome". The Tech Museum of Innovation. 24 January 2008. Archived from the original on 29 April 2012. Retrieved 5 September 2011.
- "First Diploid Human Genome Sequence Shows We're Surprisingly Different". Science Daily. 4 September 2007. Retrieved 5 September 2011.
- "Human Diversity – Go Deeper". Power of an Illusion. PBS. Archived from the original on 30 October 2013. Retrieved 6 January 2013.
- "Chimps show much greater genetic diversity than humans". Media. University of Oxford. Archived from the original on 18 December 2013. Retrieved 13 December 2013.
- Roberts, Dorothy (2011). Fatal Invention. London, New York: The New Press.
- Pertea, Mihaela; Salzberg, Steven L. (2010). "Between a chicken and a grape: estimating the number of human genes". Genome Biology. 11 (5): 206. doi:10.1186/gb-2010-11-5-206. PMC 2898077. PMID 20441615.
- Harpending, H. C.; Batzer, M. A.; Gurven, M.; Jorde, L. B.; Rogers, A. R.; Sherry, S. T. (1998). "Genetic traces of ancient demography". Proceedings of the National Academy of Sciences. 95 (4): 1961–67. Bibcode:1998PNAS...95.1961H. doi:10.1073/pnas.95.4.1961. PMC 19224. PMID 9465125.
- Jorde LB, Rogers AR, Bamshad M, Watkins WS, Krakowiak P, Sung S, Kere J, Harpending HC (1997). "Microsatellite diversity and the demographic history of modern humans". Proceedings of the National Academy of Sciences of the United States of America. 94 (7): 3100–03. Bibcode:1997PNAS...94.3100J. doi:10.1073/pnas.94.7.3100. PMC 20328. PMID 9096352.
- Cann RL, Stoneking M, Wilson AC (1987), "Mitochondrial DNA and human evolution", Nature, 325 (6099): 31–36, Bibcode:1987Natur.325...31C, doi:10.1038/325031a0, PMID 3025745, S2CID 4285418CS1 maint: ref=harv (link)
- Soares P, Ermini L, Thomson N, et al. (June 2009), "Correcting for purifying selection: an improved human mitochondrial molecular clock", Am. J. Hum. Genet., 84 (6): 740–59, doi:10.1016/j.ajhg.2009.05.001, PMC 2694979, PMID 19500773. University of Leeds – New 'molecular clock' aids dating of human migration history Archived 20 August 2017 at the Wayback Machine
- Poznik GD, Henn BM, Yee MC, Sliwerska E, Euskirchen GM, Lin AA, Snyder M, Quintana-Murci L, Kidd JM, Underhill PA, Bustamante CD (August 2013). "Sequencing Y chromosomes resolves discrepancy in time to common ancestor of males versus females". Science. 341 (6145): 562–65. Bibcode:2013Sci...341..562P. doi:10.1126/science.1237619. PMC 4032117. PMID 23908239.
- Wade, Nicholas (7 March 2007). "Still Evolving, Human Genes Tell New Story". The New York Times. Archived from the original on 14 January 2012. Retrieved 13 February 2012.
- According to 2 July 2007 Newsweek magazine, a woman dies in childbirth every minute, most often due to uncontrolled bleeding and infection, with the world's poorest women most vulnerable. The lifetime risk is 1 in 16 in sub-Saharan Africa, compared to 1 in 2,800 in developed countries.
- LaVelle, M. (1995). "Natural selection and developmental sexual variation in the human pelvis". American Journal of Physical Anthropology. 98 (1): 59–72. doi:10.1002/ajpa.1330980106. PMID 8579191.
- Correia, H.; Balseiro, S.; De Areia, M. (2005). "Sexual dimorphism in the human pelvis: testing a new hypothesis" (PDF). Homo. 56 (2): 153–60. doi:10.1016/j.jchb.2005.05.003. hdl:10316/3763. PMID 16130838.
- Rush, David (2000). "Nutrition and maternal mortality in the developing world". American Journal of Clinical Nutrition. 72 (1 Suppl): 212S–40S. doi:10.1093/ajcn/72.1.212S. PMID 10871588. Archived from the original on 18 June 2016.
- "Low Birthweight". Archived from the original on 13 May 2007. Retrieved 30 May 2007.
- Khor, G. (2003). "Update on the prevalence of malnutrition among children in Asia". Nepal Medical College Journal. 5 (2): 113–22. PMID 15024783.
- Leakey, Richard; Lewin, Roger (1993). Origins Reconsidered: In Search of What Makes Us Human. New York City: Anchor Books. ISBN 978-0-385-46792-6.
- Diamond, Jared (1997). Why is Sex Fun? The Evolution of Human Sexuality. New York City: Basic Books. pp. 167–70. ISBN 978-0-465-03127-6.
- Peccei, Jocelyn Scott (2001). "Menopause: Adaptation or epiphenomenon?". Evolutionary Anthropology. 10 (2): 43–57. doi:10.1002/evan.1013. S2CID 1665503.
- Marziali, Carl (7 December 2010). "Reaching Toward the Fountain of Youth". USC Trojan Family Magazine. Archived from the original on 13 December 2010. Retrieved 7 December 2010.
- Kalben, Barbara Blatt (2002). "Why Men Die Younger: Causes of Mortality Differences by Sex". Society of Actuaries. Archived from the original on 1 July 2013.
- "CIA World Factbook – World entry". Central Intelligence Agency. Archived from the original on 5 January 2010. Retrieved 5 July 2013.
- "Human Development Report 2006," Archived 11 October 2007 at the Wayback Machine United Nations Development Programme, pp. 363–66, 9 November 2006
- The World Factbook Archived 12 September 2009 at the Wayback Machine, U.S. Central Intelligence Agency. Retrieved 2 April 2005.
- "U.N. Statistics on Population Ageing". United Nations. 28 February 2002. Archived from the original on 8 December 2005. Retrieved 2 April 2005.
- Haenel H (1989). "Phylogenesis and nutrition". Nahrung. 33 (9): 867–87. PMID 2697806.
- Cordain, Loren (2007). "Implications of Plio-pleistocene diets for modern humans". In Peter S. Ungar (ed.). Evolution of the human diet: the known, the unknown and the unknowable. pp. 264–65.
"Since the evolutionary split between hominins and pongids approximately 7 million years ago, the available evidence shows that all species of hominins ate an omnivorous diet composed of minimally processed, wild-plant, and animal foods.
- American Dietetic, Association; Dietitians Of, Canada (2003). "Vegetarian Diets". Journal of the American Dietetic Association. 103 (6): 748–65. doi:10.1053/jada.2003.50142. PMID 12778049.
- Cordain L, Eaton SB, Sebastian A, et al. (February 2005). "Origins and evolution of the Western diet: health implications for the 21st century". Am. J. Clin. Nutr. 81 (2): 341–54. doi:10.1093/ajcn.81.2.341. PMID 15699220.
- Ulijaszek SJ (November 2002). "Human eating behaviour in an evolutionary ecological context". Proc Nutr Soc. 61 (4): 517–26. doi:10.1079/PNS2002180. PMID 12691181.
- Earliest agriculture in the Americas Archived 3 June 2010 at the Wayback Machine Earliest cultivation of barley Archived 16 February 2007 at the Wayback Machine Earliest cultivation of figs Archived 2 June 2006 at the Wayback Machine, retrieved 19 February 2007
- Krebs JR (September 2009). "The gourmet ape: evolution and human food preferences". Am. J. Clin. Nutr. 90 (3): 707S–11S. doi:10.3945/ajcn.2009.27462B. PMID 19656837.
- Holden C, Mace R (October 1997). "Phylogenetic analysis of the evolution of lactose digestion in adults". Hum. Biol. 69 (5): 605–28. PMID 9299882.
- United Nations Information Service. "Independent Expert On Effects Of Structural Adjustment, Special Rapporteur On Right To Food Present Reports: Commission Continues General Debate On Economic, Social And Cultural Rights" Archived 27 March 2009 at the Wayback Machine. United Nations, 29 March 2004, p. 6. "Around 36 million people died from hunger directly or indirectly every year.".
- Murray C, Lopez A (1997). "Global mortality, disability, and the contribution of risk factors: Global Burden of Disease Study". Lancet. 349 (9063): 1436–42. doi:10.1016/S0140-6736(96)07495-8. PMID 9164317. S2CID 2569153.
- Haslam DW, James WP (October 2005). "Obesity". Lancet. 366 (9492): 1197–209. doi:10.1016/S0140-6736(05)67483-1. PMID 16198769. S2CID 208791491.
- Catenacci VA, Hill JO, Wyatt HR (September 2009). "The obesity epidemic". Clin. Chest Med. 30 (3): 415–44, vii. doi:10.1016/j.ccm.2009.05.001. PMID 19700042.
- O'Neil, Dennis. "Adapting to Climate Extremes". Human Biological Adaptability. Palomar College. Archived from the original on 6 January 2013. Retrieved 6 January 2013.
- de Beer H (2004). "Observations on the history of Dutch physical stature from the late-Middle Ages to the present". Econ Hum Biol. 2 (1): 45–55. doi:10.1016/j.ehb.2003.11.001. PMID 15463992.
- Ilardo, M. A.; Moltke, I.; Korneliussen, T. S.; Cheng, J.; Stern, A. J.; Racimo, F.; de Barros Damgaard, P.; Sikora, M.; Seguin-Orlando, A.; Rasmussen, S.; van den Munckhof, I. C. L.; ter Horst, R.; Joosten, L. A. B.; Netea, M. G.; Salingkat, S.; Nielsen, R.; Willerslev, E. (18 April 2018). "Physiological and Genetic Adaptations to Diving in Sea Nomads". Cell. 173 (3): 569–580.e15. doi:10.1016/j.cell.2018.03.054. PMID 29677510.
- Hedrick PW (2011). "Population genetics of malaria resistance in humans". Heredity. 107 (4): 283–304. doi:10.1038/hdy.2011.16. PMC 3182497. PMID 21427751.
- Weatherall DJ (2008). "Genetic variation and susceptibility to infection: The red cell and malaria". British Journal of Haematology. 141 (3): 276–86. doi:10.1111/j.1365-2141.2008.07085.x. PMID 18410566. S2CID 28191911.
- Beja-Pereira A, et al. (2003). "Gene-culture coevolution between cattle milk protein genes and human lactase genes". Nat Genet. 35 (4): 311–13. doi:10.1038/ng1263. PMID 14634648. S2CID 20415396.
- Nina, Jablonski (2004). "The evolution of human skin and skin color". Annual Review of Anthropology. 33: 585–623. doi:10.1146/annurev.anthro.33.070203.143955.
- Rogers, Alan R.; Iltis, David; Wooding, Stephen (2004). "Genetic variation at the MC1R locus and the time since loss of human body hair". Current Anthropology. 45 (1): 105–08. doi:10.1086/381006.
- Jablonski, N.G. & Chaplin, G. (2000). "The evolution of human skin coloration" Archived 14 January 2012 at the Wayback Machine (pdf), Journal of Human Evolution 39: 57–106.
- Harding RM, Healy E, Ray AJ, et al. (April 2000). "Evidence for variable selective pressures at MC1R". Am. J. Hum. Genet. 66 (4): 1351–61. doi:10.1086/302863. PMC 1288200. PMID 10733465.
- Robin, Ashley (1991). Biological Perspectives on Human Pigmentation. Cambridge: Cambridge University Press.
- Muehlenbein, Michael (2010). Human Evolutionary Biology. Cambridge University Press. pp. 192–213.
- "The Science Behind the Human Genome Project". Human Genome Project. US Department of Energy. Archived from the original on 2 January 2013. Retrieved 6 January 2013.
Almost all (99.9%) nucleotide bases are exactly the same in all people.
- O'Neil, Dennis. "Ethnicity and Race: Overview". Palomar College. Archived from the original on 6 January 2013. Retrieved 6 January 2013.
- "Genetic – Understanding Human Genetic Variation". Human Genetic Variation. National Institute of Health (NIH). Archived from the original on 25 August 2013. Retrieved 13 December 2013.
In fact, research results consistently demonstrate that about 85 percent of all human genetic variation exists within human populations, whereas about only 15 percent of variation exists between populations.
- Goodman, Alan. "Interview with Alan Goodman". Race Power of and Illusion. PBS. Archived from the original on 29 October 2012. Retrieved 6 January 2013.
- Marks, J. (2010) Ten facts about human variation. In: Human Evolutionary Biology, edited by M. Muehlenbein. New York: Cambridge University Press "Archived copy" (PDF). Archived from the original (PDF) on 15 April 2012. Retrieved 5 September 2013.CS1 maint: archived copy as title (link)
- Jorde, L.; Watkins, W; Bamshad, M; Dixon, M; Ricker, C.; Seielstad, M.; Batzer, M. (2000). "The distribution of human genetic diversity: a comparison of mitochondrial, autosomal, and Y-chromosome data". American Journal of Human Genetics. 66 (3): 979–88. doi:10.1086/302825. PMC 1288178. PMID 10712212.
- "New Research Proves Single Origin Of Humans In Africa". Science Daily. 19 July 2007. Archived from the original on 4 November 2011. Retrieved 5 September 2011.
- Manica, A; Amos, W; Balloux, F; Hanihara, T (2007). "The effect of ancient population bottlenecks on human phenotypic variation". Nature. 448 (7151): 346–48. Bibcode:2007Natur.448..346M. doi:10.1038/nature05951. PMC 1978547. PMID 17637668.
- Bergström, A; McCarthy, S; Hui, R; Almarri, M; Ayub, Q (2020). "Insights into human genetic variation and population history from 929 diverse genomes". Science. 367 (6484): eaay5012. doi:10.1126/science.aay5012. PMC 7115999. PMID 32193295. S2CID 213191877. "Populations in central and southern Africa, the Americas, and Oceania each harbor tens to hundreds of thousands of private, common genetic variants. Most of these variants arose as new mutations rather than through archaic introgression, except in Oceanian populations, where many private variants derive from Denisovan admixture."
- Gustafsson A, Lindenfors P (2004). "Human size evolution: no allometric relationship between male and female stature". Journal of Human Evolution. 47 (4): 253–66. doi:10.1016/j.jhevol.2004.07.004. PMID 15454336.
- "Ogden et al (2004). Mean Body Weight, Height, and Body Mass Index, United States 1960–2002 Advance Data from Vital and Health Statistics, Number 347, October 27, 2004" (PDF). Archived (PDF) from the original on 23 February 2011. Retrieved 27 July 2013.
- Miller, AE; MacDougall, JD; Tarnopolsky, MA; Sale, DG (1993). "Gender differences in strength and muscle fiber characteristics". European Journal of Applied Physiology and Occupational Physiology. 66 (3): 254–62. doi:10.1007/BF00235103. hdl:11375/22586. PMID 8477683. S2CID 206772211.
- Dominance and the evolution of sexual dimorphism in human voice pitch Puts, David Andrew and Gaulin, Steven J.C and Verdolini, Katherine; Evolution and Human Behavior, ISSN 1090-5138, 2006, Volume 27, Issue 4, pp. 283–96
- Gender, women, and health Archived 25 June 2013 at the Wayback Machine Reports from WHO 2002–2005
- Marks, Jonathan. "Interview with Jonathan Marks". Race – The Power of an Illusion. PBS. Archived from the original on 12 November 2012. Retrieved 6 January 2013. Lay summary.
- Goodman, Alan. "Background Readings". Race – Power of an Illusion. PBS. Archived from the original on 23 May 2013. Retrieved 6 January 2013.
- Nina, Jablonski (2004). "The evolution of human skin and skin color". Annual Review of Anthropology. 33: 585–623. doi:10.1146/annurev.anthro.33.070203.143955.
genetic evidence [demonstrate] that strong levels of natural selection acted about 1.2 mya to produce darkly pigmented skin in early members of the genus Homo
- Bower, C.; Stanley (1992). "The role of nutritional factors in the aetiology of neural tube defects". Journal of Paediatrics and Child Health. 28 (1): 12–16. doi:10.1111/j.1440-1754.1992.tb02610.x. PMID 1554510.
- O'Neil, Dennis. "Overview". Modern Human Variation. Palomar College. Archived from the original on 5 November 2012. Retrieved 6 January 2013.
- Keita, S O Y; Kittles, R A; Royal, C D M; Bonney, G E; Furbert-Harris, P; Dunston, G M; Rotimi, C N (2004). "Conceptualizing human variation". Nature Genetics. 36 (11 Suppl): S17–20. doi:10.1038/ng1455. PMID 15507998.
- "Census, race and science". Nature Genetics. 24 (2): 97–98. 2000. doi:10.1038/72884. PMID 10655044.
That race (...) is not a scientific term is generally agreed upon by scientists—and a message that cannot be repeated often enough.
- O'Neil, Dennis. "Models of Classification". Modern Human Variation. Palomar College. Archived from the original on 6 January 2013. Retrieved 6 January 2013.
- Harrison, Guy (2010). Race and Reality. Amherst: Prometheus Books.
Race is a poor empirical description of the patterns of difference that we encounter within our species. The billions of humans alive today simply do not fit into neat and tidy biological boxes called races. Science has proven this conclusively. The concept of race (...) is not scientific and goes against what is known about our ever-changing and complex biological diversity.
- Roberts, Dorothy (2011). Fatal Invention. London, New York: The New Press.
The genetic differences that exist among populations are characterized by gradual changes across geographic regions, not sharp, categorical distinctions. Groups of people across the globe have varying frequencies of polymorphic genes, which are genes with any of several differing nucleotide sequences. There is no such thing as a set of genes that belongs exclusively to one group and not to another. The clinal, gradually changing nature of geographic genetic difference is complicated further by the migration and mixing that human groups have engaged in since prehistory. Genetic studies have substantiated the absence of clear biological borders; thus the term "race" is rarely used in scientific terminology, either in biological anthropology and in human genetics. Race has no genetic or biological basis. Human beings do not fit the zoological definition of race. Race is not a biological category that is politically charged. It is a political category that has been disguised as a biological one.
- Goodman, Alan. "Interview with Alan Goodman". Race Power of and Illusion. PBS. Archived from the original on 29 October 2012. Retrieved 6 January 2013. Lay summary.
There's no biological basis for race. And that is in the facts of biology, the facts of non-concordance, the facts of continuous variation, the recentness of our evolution, the way that we all commingle and come together, and how genes flow. (...) There's no generalizability to race. There is no center there (...). It's fluid.
- Steve Olson, Mapping Human History: Discovering the Past Through Our Genes, Boston, 2002
- Jablonski, Nina (2004). "The evolution of human skin and skin color". Annual Review of Anthropology. 33: 585–623. doi:10.1146/annurev.anthro.33.070203.143955.
- Palmié, Stephan (May 2007). "Genomics, divination, 'racecraft'". American Ethnologist. 34 (2): 205–22. doi:10.1525/ae.2007.34.2.205.
- 3-D Brain Anatomy Archived 5 September 2017 at the Wayback Machine, The Secret Life of the Brain, Public Broadcasting Service. Retrieved 3 April 2005.
- Grandner, Michael A.; Patel, Nirav P.; Gehrman, Philip R.; Perlis, Michael L.; Pack, Allan I. (2010). "Problems associated with short sleep: bridging the gap between laboratory and epidemiological studies". Sleep Medicine Reviews. 14 (4): 239–47. doi:10.1016/j.smrv.2009.08.001. PMC 2888649. PMID 19896872.
- Intelligence test at the Encyclopædia Britannica
- Ned Block: On a Confusion about a Function of Consciousness in: The Behavioral and Brain Sciences, 1995.
- Saul McLeod (20 March 2020). "Maslow's Hierarchy of Needs". Simplypsychology.org. Simply Scholar Limited. Retrieved 4 April 2020.
Maslow's hierarchy of needs is a motivational theory in psychology comprising a five-tier model of human needs, often depicted as hierarchical levels within a pyramid. Needs lower down in the hierarchy must be satisfied before individuals can attend to needs higher up.
- Heckhausen, J.; Heckhausen, H. (28 March 2018). Motivation and Action. Introduction and Overview: Springer, Cham. p. 1. doi:10.1007/978-3-319-65094-4_1. ISBN 978-3-319-65093-7.
- "Sexual orientation, homosexuality and bisexuality". American Psychological Association. Archived from the original on 8 August 2013. Retrieved 10 August 2013.
- Bailey JM; Vasey PL; Diamond LM; Breedlove SM; Vilain E; Epprecht M (2016). "Sexual Orientation, Controversy, and Science". Psychological Science in the Public Interest. 17 (21): 45–101. doi:10.1177/1529100616637616. PMID 27113562. S2CID 42281410.
- Buss, David M. (2003). The Evolution of Desire: Strategies of Human Mating. Revised Edition. New York City: Basic Books. ISBN 978-0-465-00802-5.
- "World". The World Factbook. CIA. 17 May 2016. Archived from the original on 5 January 2010. Retrieved 2 October 2016.
- "The World's Cities in 2016" (PDF). United Nations. Archived (PDF) from the original on 1 October 2017. Retrieved 16 October 2017.
- "Statistical Summaries". Ethnologue. Archived from the original on 4 April 2012. Retrieved 10 December 2011.
- "CIA – The World Factbook". Cia.gov. Archived from the original on 5 January 2010. Retrieved 10 December 2011.
- The Precipice: Existential Risk and the Future of Humanity. Hachette Books. 2020. ISBN 9780316484893.
Homo sapiens and our close relatives may have some unique physical attributes, such as our dextrous hands, upright walking and resonant voices. However, these on their own cannot explain our success. They went together with our intelligence...
- Goldman, Jason G. (2012). "Pay attention… time for lessons at animal school". bbc.com. Retrieved 22 April 2020.
- Winkler, M.; Mueller, J. L.; Friederici, A. D.; Männel, C. (21 November 2018). "Infant cognition includes the potentially human-unique ability to encode embedding". Science Advances. 4 (11): eaar8334. doi:10.1126/sciadv.aar8334. PMC 6248967. PMID 30474053.
- Johnson-Frey, Scott H (July 2003). "What's So Special about Human Tool Use?". Neuron. 39 (2): 201–204. doi:10.1016/S0896-6273(03)00424-0. PMID 12873378. S2CID 18437970.
- Emery, Nathan J; Clayton, Nicola S (February 2009). "Tool use and physical cognition in birds and mammals". Current Opinion in Neurobiology. 19 (1): 27–33. doi:10.1016/j.conb.2009.02.003. PMID 19328675. S2CID 18277620.
In short, the evidence to date that animals have an understanding of folk physics is at best mixed.
- "Chimps Can't Cook, But Maybe They'd Like To". National Geographic News. 2 June 2015. Retrieved 22 April 2020.
- "The Book of Humans by Adam Rutherford review – a pithy homage to our species". the Guardian. 9 October 2018. Retrieved 22 April 2020.
- Nicholls, Henry (29 June 2015). "Babblers speak to the origin of language". The Guardian. Retrieved 22 April 2020.
- Deleniv, Sofia (2018). "The 'me' illusion: How your brain conjures up your sense of self". New Scientist. Retrieved 22 April 2020.
- Alexander, R. McN. (May 2004). "Bipedal animals, and their differences from humans". Journal of Anatomy. 204 (5): 321–330. doi:10.1111/j.0021-8782.2004.00289.x. PMC 1571302. PMID 15198697.
- Dasgupta, Shreya (2015). "Can any animals talk and use language like humans?". bbc.com. Retrieved 22 April 2020.
Most animals are not vocal learners.
- Liebenberg, Louis (December 2008). "The relevance of persistence hunting to human evolution". Journal of Human Evolution. 55 (6): 1156–1159. doi:10.1016/j.jhevol.2008.07.004. PMID 18760825.
- "Why are humans good at endurance running? The answer is murky". Popular Science. 2019. Retrieved 22 April 2020.
- "Can We Really Know What Animals Are Thinking?". Snopes.com. 2019. Retrieved 22 April 2020.
- "Many Animals—Including Your Dog—May Have Horrible Short-Term Memories". National Geographic News. 26 February 2015. Retrieved 6 September 2020.
- Schmidt, Karen L.; Cohn, Jeffrey F. (2001). "Human facial expressions as adaptations: Evolutionary questions in facial expression research". American Journal of Physical Anthropology. 116 (S33): 3–24. doi:10.1002/ajpa.20001. PMC 2238342. PMID 11786989.
- "Tears in Her Eyes: A Turnoff for Guys?". ABC News (American). 2011. Retrieved 22 April 2020.
- Comrie, Bernard; Polinsky, Maria; Matthews, Stephen (1996). The Atlas of Languages: The Origin and Development of Languages Throughout the World. New York City: Facts on File. pp. 13–15. ISBN 978-0-8160-3388-1.
- Ridgeway, C.L. (2001). ISBN 9780080430768. Missing or empty
- Laland, Kevin N.; Brown, Gillian (2011). Sense and Nonsense: Evolutionary Perspectives on Human Behaviour. Oxford University Press. p. 7. ISBN 978-0-19-958696-7.
- J. Hutchinson & A.D. Smith (eds.), Oxford readers: Ethnicity (Oxford 1996), "Introduction"[page needed]
- Smith, Anthony D. (1999) Myths and Memories of the Nation. Oxford University Press. pp. 4–7
- Banton, Michael (2007). "Max Weber on 'ethnic communities': a critique". Nations and Nationalism. 13 (1): 19–35. doi:10.1111/j.1469-8129.2007.00271.x.
- Delanty, Gerard & Krishan Kumar (2006) The SAGE Handbook of Nations and Nationalism. SAGE. ISBN 1412901014 p. 171
- Ronald Cohen 1978 "Ethnicity: Problem and Focus in Anthropology" in Annual Review of Anthropology 7: 383 Palo Alto: Stanford University Press
- Thomas Hylland Eriksen (1993) Ethnicity and Nationalism: Anthropological Perspectives. London: Pluto Press[page needed]
- Schizzerotto, Antonio. "Social Stratification" (PDF). University of Trento. Archived from the original (PDF) on 20 March 2018. Retrieved 3 July 2017.
- Fukuyama, Francis. (2012). The origins of political order : from prehuman times to the French Revolution. Farrar, Straus and Giroux. p. 53. ISBN 978-0-374-53322-9. OCLC 1082411117.
- Holslag, Jonathan, author., A political history of the world : three thousand years of war and peace, pp. 24–25, ISBN 978-0-241-38466-4, OCLC 1080190517CS1 maint: multiple names: authors list (link)
- Christian, David (2004). Maps of Time. University of California Press. ISBN 978-0-520-24476-4.
- Ferguson, Niall. "The Next War of the World." Foreign Affairs, Sep/Oct 2006
- Clark, J.D.; de Heinzelin, J.; Schick, K.D.; et al. (1994). "African Homo erectus: old radiometric ages and young Oldowan assemblages in the Middle Awash Valley, Ethiopia". Science. 264 (5167): 1907–10. Bibcode:1994Sci...264.1907C. doi:10.1126/science.8009220. PMID 8009220.
- Kvavadze E, Bar-Yosef O, Belfer-Cohen A, Boaretto E, Jakeli N, Matskevich Z, Meshveliani T (2009). "30,000-year-old wild flax fibers". Science. 325 (5946): 1359. Bibcode:2009Sci...325.1359K. doi:10.1126/science.1175404. PMID 19745144. S2CID 206520793.
- Margo DeMello (2007). Encyclopedia of Body Adornment. ABC-CLIO. pp. 17–. ISBN 978-0-313-33695-9. Archived from the original on 28 May 2013. Retrieved 6 April 2012.
- "Evolutionary Religious Studies: A New Field of Scientific Inquiry". Archived from the original on 17 August 2009.
- Boyer, Pascal (2008). "Being human: Religion: bound to believe?". Nature. 455 (7216): 1038–39. Bibcode:2008Natur.455.1038B. doi:10.1038/4551038a. PMID 18948934. S2CID 205040781.
- Emmons, Robert A.; Paloutzian, Raymond F. (2003). "The psychology of religion". Annual Review of Psychology. 54 (1): 377–402. doi:10.1146/annurev.psych.54.101601.145024. PMID 12171998.
- Hall, Daniel E.; Meador, Keith G.; Koenig, Harold G. (2008). "Measuring religiousness in health research: review and critique". Journal of Religion and Health (Submitted manuscript). 47 (2): 134–63. doi:10.1007/s10943-008-9165-2. PMID 19105008. S2CID 25349208.
- Morriss-Kay, Gillian M (2010). "The evolution of human artistic creativity". Journal of Anatomy. 216 (2): 158–176. doi:10.1111/j.1469-7580.2009.01160.x. ISSN 0021-8782. PMC 2815939. PMID 19900185.
- Joordens, Josephine C. A.; d’Errico, Francesco; Wesselingh, Frank P.; Munro, Stephen; de Vos, John; Wallinga, Jakob; Ankjærgaard, Christina; Reimann, Tony; Wijbrans, Jan R.; Kuiper, Klaudia F.; Mücher, Herman J. (2015). "Homo erectus at Trinil on Java used shells for tool production and engraving". Nature. 518 (7538): 228–231. doi:10.1038/nature13962. ISSN 1476-4687.
- St. Fleur, Nicholas (12 September 2018). "Oldest Known Drawing by Human Hands Discovered in South African Cave". The New York Times. Retrieved 20 September 2018.
- Radford, Tim; editor, science (16 April 2004). "World's oldest jewellery found in cave". The Guardian. ISSN 0261-3077. Retrieved 23 September 2020.CS1 maint: extra text: authors list (link)
- Dissanayake, Ellen (2008). "THE ARTS AFTER DARWIN: DOES ART HAVE AN ORIGIN AND ADAPTIVE FUNCTION?". In Zijlmans, K; van Damme, W (eds.). World Art Studies: Exploring Concepts and Approaches. Amsterdam: Valiz. pp. 241–263.
- I, Morley (2014). "A multi-disciplinary approach to the origins of music: perspectives from anthropology, archaeology, cognition and behaviour". Journal of anthropological sciences = Rivista di antropologia : JASS. PMID 25020016. Retrieved 21 September 2020.
- Trost, Wiebke; Frühholz, Sascha; Schön, Daniele; Labbé, Carolina; Pichon, Swann; Grandjean, Didier; Vuilleumier, Patrik (1 December 2014). "Getting the beat: Entrainment of brain activity by musical rhythm and pleasantness". NeuroImage. 103: 55–64. doi:10.1016/j.neuroimage.2014.09.009. ISSN 1053-8119.
- Fj, Karpati; C, Giacosa; Ne, Foster; Vb, Penhune; Kl, Hyde (2015). "Dance and the brain: a review". Annals of the New York Academy of Sciences. PMID 25773628. Retrieved 21 September 2020.
- March 2010, Denise Chow-Assistant Managing Editor 22. "Why Do Humans Dance?". livescience.com. Retrieved 21 September 2020.
- "Why do we like to dance--And move to the beat?". Scientific American. Retrieved 21 September 2020.
- Prior, Karen Swallow (21 June 2013). "How Reading Makes Us More Human". The Atlantic. Retrieved 23 September 2020.
- Puchner, Martin. "How stories have shaped the world". www.bbc.com. Retrieved 23 September 2020.
- Hernadi, Paul (2001). "Literature and Evolution". SubStance. 30 (1/2): 55–71. doi:10.2307/3685504. ISSN 0049-2426.
- "scientific method", Oxford Dictionaries: British and World English, 2016, retrieved 28 May 2016
- Mary C. Olmstead & Valerie A. Kuhlmeier, Comparative Cognition (Cambridge University Press, 2015), pp. 209-10.
- "Branches of Science" (PDF). University of Chicago. Archived from the original (PDF) on 23 April 2017. Retrieved 26 June 2017.
- "Science and Pseudo-Science". Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University. 2017. Archived from the original on 11 June 2017. Retrieved 3 July 2017.
- Archaeology Info
- Homo sapiens – The Smithsonian Institution's Human Origins Program
- "Homo sapiens Linnaeus, 1758" at the Encyclopedia of Life
- View the human genome on Ensembl
- Human Timeline (Interactive) – Smithsonian, National Museum of Natural History (August 2016).
- Media related to Homo sapiens at Wikimedia Commons