“Instead, its advantage is in protecting against excessive heat exposure from solar radiation while still allowing heat loss,” says a team led by Tina Lasisi, an anthropologist at Penn State University in the US.
Tightly curled hair is a uniquely human characteristic, and its ubiquity in Africa in spit of the continent’s wide genetic diversity means a study of its role was long overdue, Lasisi says in a paper posted on the preprint serverAs humanity’s ancestors started to walk on two feet and develop larger brains, scalp hair may have struck the best balance between maximising heat loss across the whole body and minimising heat gain directly over the brain.
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