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Low testosterone could be what made us civilized humans - The Washington Post

Stashed in: Science!, Anthropology

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3 cheers for less aggression. 

The hormone, associated with both biologically male characteristics and aggression, makes skulls grow those heavy brows we associate with our evolutionary ancestors. Lead author Robert Cieri, a graduate student of biology at the University of Utah, said in a news release that a study of 1,400 modern and ancient skulls provided insight into how these changes might have overlapped with cultural shifts.

While the modern human — species Homo sapiens — appears in the fossil record around 200,000 years ago, evidence of the kind of “modernity” we associate with our species (like advanced tools and symbolic artifacts) took an additional 150,000 years to appear.

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