Human Advances Came As Testosterone Levels Dropped And People Became Nicer To Each Other

Researchers from Duke University and the universities of Utah and Iowa say a drop in testosterone levels may have been responsible for the development of civilization. Reporting in the journal Current Anthropology, Brian Hare and Jingzhi Tan of Duke, Robert Cieri of Utah and Robert Franciscus of Iowa said as testosterone levels dropped tool-making and art flourished.