Human evolution gathered speed when testosterone levels dropped and people learned to be nicer to each other, reveals a new study. The study found that the shape of human skull changed at the same time that people started creating art and using more advanced tools.
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Research: Humans became nicer 50,000 years ago
Rounder features and less prominent brows indicate lower levels of testosterone acting on the skeleton. Researchers at Duke University performed comparisons between more than 1,400 modern and ancient skulls.