We Homo sapiens have been around for 200,000 years.
So why did it take us 150,000 years to create the first art and advanced tools?
Testosterone, according to a study in the journal Current Anthropology.
Robert Cieri, a University of Utah biology graduate student, studied more than 1,400 skulls. Higher T levels can be seen in the more pronounced brow ridges of ancient skulls. The rounder, more feminine faces of modern man indicate lower testosterone.
The craniofacial evidence, Cieri says, and the corresponding “lowered testosterone levels could explain the relatively sudden origin of modern behavior about 50,000 years ago.”
Less aggression and more cooperation have been seen in humans and non-humans with lower T.
“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,” Cieri says.
Read more here.