Скачать или смотреть Why Does Hair Turn Gray?

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-an...
https://www.ncbi.nlm.nih.gov/pubmed/2...
http://kidshealth.org/en/kids/gray-ha...
http://www.iflscience.com/health-and-...