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No. 16970
ID: ea9ac3
I don't subscribe to this magazine, but I remember this issue came up before.
You would be surprised the amount of work it takes to cool the body. Perspiration frees the mouth to do other things than pant--like develop language. Sweating cannot function at maximum effectiveness if there is a layer of fur trapping heat. This effective (though water intensive) mechanism for temperature control increases the range of the human by keeping the body evenly cool while allowing more oxygen intake. This means better chances at hunting. But that also means that humans had to get more clever at hunting to match their extended range. And when you extend range beyond your indigenous biosphere, you have to get very clever at survival. Getting clever involves more nuanced communication skills, and thus a mouth unencumbered with thermo-regulative duties. Encountering cold environments forces the invention of clothing. It is easier to keep warm than to keep from overheating.
Head hair probably stayed as scalp protection from the sun, pubic hair holds sexual pheromones, and armpit hair wicks sweat away from the folds of the underarm to prevent mold and bacterial growth.
And all this came from us trading in our pelts for a body covered in sweat glands. A less than fashionable decision, but one that has benefited us greatly in the long run.
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