Blooming Human Society and Technology Boom Linked to Less Testosterone

"...The researchers measured more than 1,400 ancient and modern skulls and found that when cultural advancements were made, heavy brows were out and rounder heads were in. These changes can be blamed on less testosterone working on their skeletons...."

http://www.scienceworldreport.com/articles/16413/20140804/blooming-human-society-technology-boom-linked-less-testosterone.htm