What's the purpose of the hair on your head growing indefinitely?

What's the purpose of the hair on your head growing indefinitely?
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1 Answer

Answer :

It is because of clothes. Our bodies decided that is was a waste to grow hair under the warm things we drape over our selves, that is why body hair is shorter and sparse. Most of heat loss is through our head, so we need more hair there to keep warm. This is all controlled by our genes, but I do not know why our hair continues to grow on our heads without stopping at a pre-determined length. Imagine if we could modify our genes to select our hair length. That would be a disaster to barbers!
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