http://science.howstuffworks.com/question100.htm
It relates arm hair to head hair, but I'm sure we can all extrapolate :>
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"But I don't want to go among mad people," Alice remarked.
"Oh, you can't help that," said the Cat: "We are all mad here. I'm mad. You're mad."
"How do you know I'm mad?" said Alice.
"You must be," said the Cat. "Or else you wouldn't have come here."
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