An anonymous reader writes Even though modern humans started appearing around 200,000 years ago, it was only about 50,000 years ago that artistry and tool making became popular. New research shows that society bloomed when testosterone levels in humans started dropping. A paper published in the journal Current Anthropology, suggests that a testosterone deficit facilitated the friendliness and cooperation between humans, which lead to modern society. "Whatever the cause, reduced testosterone levels enabled increasingly social people to better learn from and cooperate with each other, allowing the acceleration of cultural and technological innovation that is the hallmark of modern human success," says University of Utah biology graduate student Robert Cieri.
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