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Gray hair is more noticeable in people with darker hair because it stands out, but people with naturally lighter hair are just as likely to go gray. From the time a person notices a few gray hairs, it may take more than 10 years for all of that person's hair to turn gray.
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kidshealth.org/kid/grownup/getting_older/gray_hair.html
kidshealth.org/kid/grownup/getting_older/gray_hair.html
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Why does hair turn gray?(Everyday Mysteries: Fun Science Facts from the Library of Congress) ... So why does our hair turn gray or white?; Dr. Desmond Tobin, professor of cell biology from the University of Bradford in England, suggests that the hair follicle has a “melanogentic clock” which slows down or stops...
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www.loc.gov/rr/scitech/mysteries/grayhair.html
www.loc.gov/rr/scitech/mysteries/grayhair.html
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Hair goes gray because pigment cells in the hair base at the roots of the hair stop producing melanin. ... It doesn't matter if you are fair-haired or dark-haired you have the same chances of getting gray hair. However, it is more noticeable in darker haired people.
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www.coolquiz.com/trivia/explain/docs/grayhair.asp
www.coolquiz.com/trivia/explain/docs/grayhair.asp
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"Gray hair" is hair with a reduced level of melanocytes, so the hair has a color, the same color as was previous, but the color appears paler. ... Go to: How Does Hair Turn White? ; ... A hair may gradually "turn gray"
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www.hennaforhair.com/gray/graying2.html
www.hennaforhair.com/gray/graying2.html
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How does hair turn gray? The melanocytes in hair stop producing melanins! Everybody has melanocytes, in their skin and in their hair. Some people have very active melanocytes: dark skinned people have highly productive epidermal melanocytes.
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www.hennaforhair.com/gray/graying1.html
www.hennaforhair.com/gray/graying1.html
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But your entire head of hair won't turn gray overnight; after all, this is a process that takes about 10-20 years. So when exactly will your hair start turning gray? It'll probably depend on your own biological timeclock, as set by the genes you've inherited from your parents, your parents' parents, and beyond.
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www.faqkids.com/idx/18/034/
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