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RE: A serious question about hair!
I looked this up years ago and all I remember of the answer now is "because that's the way it is," Your leg hair has a standard length that isn't like the hair on your head. If you read the Wikipedia article on human hair you'll find the science.
Lol, "Because that's the way it is" still seems to be the answer! It's Wikipedia that states that "the anagen phase is ended by an unknown signal". I find it fascinating that you can still stumble across things like this that no one knows the answer to! :)