Did a Drop in Testosterone Civilize Modern Humans?

┬áSummary Anatomically modern humans first appeared around 200,000 years ago, but small changes in skull shape continued until around 50,000 years ago. A new study has revealed that several of the changes in the shape of the human face can be explained by a gradual drop in the levels of circulating testosterone. High testosterone is … More Did a Drop in Testosterone Civilize Modern Humans?