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Why Does Hair Turn Gray?

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 Biology   |   Health   |   Science
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Hair can be so many different colors, but why do so many adults have gray hair?

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SOURCES:

http://www.webmd.com/skin-problems-and-treatments/picture-of-the-hair#1
https://www.ncbi.nlm.nih.gov/pubmed/21466661
http://kidshealth.org/en/kids/gray-hair.html
http://www.iflscience.com/health-and-medicine/why-does-hair-change-colour-and-turn-gray/

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