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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.
The nature of interaction between early humans and these sister species has been a long-standing source of controversy, the question being whether humans replaced these earlier species or whether they were in fact similar enough to interbreed, in which case these earlier populations may have contributed genetic material to modern humans.
In scientific terms, the meanings of "hominid" and "hominin" have changed during the recent decades with advances in the discovery and study of the fossil ancestors of modern humans.
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 fertile year round, and in which no special signals of fertility are produced by the body (such as genital swelling during estrus).
Social interactions between humans have established an extremely wide variety of values, social norms, and rituals, which together form the basis of human society.
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.