Curls may be why humans have such big brains. A new study—involving a mannequin wearing wigs in a wind tunnel—reveals how
But Caldararo notes it’s awith many variables: for example, white hair that reflects light might be better protection from the sun than black hair that absorbs its heat, he says.
For example, the Asian hair used in the study tends to be round in cross-section and therefore absorbs more heat than some types of African hair, where each hair is shaped like a long ribbon that curls more easily, he says.at the University of California San Diego, who also wasn’t involved in the study, says the research is “a great leap forward about thinking why we have so much hair on our heads.
But she doesn’t think that’s likely; and the study proposes instead that genes for curly hair arose much earlier in human evolution, perhaps around two million years ago whenwas the dominant hominin. And as hominin brains grew bigger, it suggests, the genes for curly hair that protected the scalp from the sun may have given those who had them an advantage.
“Maybe once we had those larger brains, we also had all these cultural adaptations to avoid overheating, like better sources of water,” she says. “And at that point, maybe there wasn’t such a selective pressure for curly hair.”
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