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Curiosity and the human desire to understand and influence the environment and to explain and manipulate phenomena (or events) has provided the foundation for developing science, philosophy, mythology, religion, anthropology, and numerous other fields of knowledge.

The genus Homo evolved and diverged from other hominins in Africa, after the human clade split from the chimpanzee lineage of the hominids (great apes) branch of the primates.

Modern humans, defined as the species Homo sapiens or specifically to the single extant subspecies Homo sapiens sapiens, proceeded to colonize all the continents and larger islands, arriving in Eurasia 125,000–60,000 years ago, By using the technique called a molecular clock which estimates the time required for the number of divergent mutations to accumulate between two lineages, the approximate date for the split between lineages can be calculated.

Our Word of the Year choice serves as a symbol of each year’s most meaningful events and lookup trends.

It is an opportunity for us to reflect on the language and ideas that represented each year.

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.

Further information: Anatomically modern humans, Archaic human admixture with modern humans, Early human migrations, Multiregional origin of modern humans, Prehistoric autopsy, and Recent African origin of modern humans As modern humans spread out from Africa they encountered other hominids such as Homo neanderthalensis and the so-called Denisovans.

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.

Today the global human population is estimated by the United Nations to be near 7.6 billion.

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

There is also a distinction between anatomically modern humans and Archaic Homo sapiens, the earliest fossil members of the species.