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Hair Today, Gone Tomorrow
A Natural (Selection) Look
Why Body Hair?
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Key Facts In This Video
All hair is made of the protein keratin. 00:37
Different types of hair have growth phases of differing lengths, which is why your underarm hair can only grow to a few inches long. 01:30
Humans may have evolved pubic and underarm hair to trap and transmit pheromones to potential mates. 03:24
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