Researchers at Duke University and the University of Utah say the rise of human civilization as we know it is linked to a drop in testosterone levels. The paper, published in the journal Current Anthropology, posits that a testosterone deficit facilitated the friendliness and cooperation between humans, which lead to modern society. Study lead Robert Cieri posits "reduced testosterone levels enabled increasingly social people to better learn from and cooperate with each other." Comparing the newer skulls to the ancient ones, researchers noticed a sharp decline in features sculpted by testosterone; modern skulls have smaller brows and more rounded faces. [link]
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