![Why do we have hair in such random places? - Nina G. Jablonski](https://i.ytimg.com/vi/wd18yfQqa8A/sddefault.jpg)
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body hair fur primates evolution human hair animal fur hair follicles keratin mammals ground hairs guard hair hominin species sweat glands temperature regulation eyebrows facial hair pubic hair apocrine glands vellus hair stem cells nerve endings why don't humans have fur science biology apes chimpanzee education animation nina jablonski igor coric artrake studio TED TED-Ed TED Ed Teded Ted Education