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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. 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.Homo erectus were the first of the hominina to leave Africa, and these species spread through Africa, Asia, and Europe between . erectus, also sometimes classified as a separate species Homo ergaster, stayed in Africa and evolved into Homo sapiens. that intelligence increased as a response to an increased necessity for solving social problems as human society became more complex.More recently, however, in 2015, stone tools, perhaps predating Homo habilis, have been discovered in northwestern Kenya that have been dated to 3.3 million years old. 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 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.Nonetheless, the brains of Homo habilis were about the same size as that of a chimpanzee, and their main adaptation was bipedalism as an adaptation to terrestrial living. However, the differences between the structure of human brains and those of other apes may be even more significant than differences in size.It is believed that these species were the first to use fire and complex tools. ergaster/erectus and archaic humans are from Africa such as Homo rhodesiensis, but seemingly transitional forms are also found at Dmanisi, Georgia. 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.They are characterized by erect posture and bipedal locomotion; high manual dexterity and heavy tool use compared to other animals; and a general trend toward larger, more complex brains and societies.

In common usage, the word "human" generally refers to the only extant species of the genus Homo—anatomically and behaviorally modern Homo sapiens.

These human societies subsequently expanded in size, establishing various forms of government, religion, and culture around the world, unifying people within regions to form states and empires.

The rapid advancement of scientific and medical understanding in the 19th and 20th centuries led to the development of fuel-driven technologies and increased lifespans, causing the human population to rise exponentially.

Each of these species has been argued to be a bipedal ancestor of later hominins, but all such claims are contested. The relationship between all these changes is the subject of ongoing debate.

It is also possible that any one of the three is an ancestor of another branch of African apes, or is an ancestor shared between hominins and other African Hominoidea (apes). 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.

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