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    How does the hair on your head and chin know to grow long, but the hair on your eyebrows or arms stays short?

    Question #117249. Asked by star_gazer. (Sep 02 10 9:58 AM)


    Plodd

    		The cells that make the hairs on your arms are programmed to stop growing every couple of months, so the hair on your arms stays short. The hair follicles on your head, on the other hand, are programmed to let hair grow for years at a time, so the hair can grow very long.

    http://tlc.howstuffworks.com/style/question100.htm

    Sep 02 10, 10:53 AM

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