humans evolved a magnificent cooling system by taking advantage of special water-secreting glands that most animals have only on their paws. Monkeys and apes have small quantities of these so-called eccrine glands elsewhere on their bodies, but we alone have five to ten million sweat glands all over our skin, especially on our heads, limbs, and chests.15 Sweating effectively turns the entire body into a giant, wet tongue. We also lost our fur, which helps air move along the skin’s surface without any barrier, thus enabling us to rapidly dump prodigious quantities of heat.
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