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In more recent times rationalists, [[Theory of evolution|Evolutionists]] and scientists in the fields of biology and more specifically, anthropology, have postulated that humans have been around in anatomically modern form for approximately 130,000 years<ref>Alemseged Z, Coppens Y, Geraads D (2002). "Hominid cranium from Omo: Description and taxonomy of Omo-323-1976-896". Am J Phys Anthropol 117 (2): 103-12.</ref>. One version of the this theory maintains homo sapiens evolved from Homo ergaster or erectus, and from other earlier primates. Humans' closest living relative is the chimpanzee.