https://www.nationalgeographic.com/premium/article/curly-hair-evolutionary-advantage-brain-protect
"Three wigs were made from black human hair sourced from China—one straight, one moderately curly, and one tightly curled—so that the researchers could observe how different hair textures affected heat gain and loss on the scalp. They also calculated heat loss at different windspeeds, after wetting the wigs to simulate sweating.
...
“Sweating isn’t free—you’re losing water and electrolytes. And for our hominin ancestors that could have been important.”
"Three wigs were made from black human hair sourced from China—one straight, one moderately curly, and one tightly curled—so that the researchers could observe how different hair textures affected heat gain and loss on the scalp. They also calculated heat loss at different windspeeds, after wetting the wigs to simulate sweating.
...
“Sweating isn’t free—you’re losing water and electrolytes. And for our hominin ancestors that could have been important.”
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