When Did Women Start to Grow Out and Paint Their Nails

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In this video:

On humans and other primates, nails are a flattened version of a claw which likely developed to aid in gripping and climbing. However, they can also act as a visible “health report.” Someone in poor health, or infected by a fungus, might have yellow, brittle nails, while someone in good health might have strong, long nails.

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Sources:

http://www.wisegeek.org/when-did-wome...
http://en.wikipedia.org/wiki/Artifici...
http://www.guinnessworldrecords.com/l...
http://en.wikipedia.org/wiki/Lee_Redmond
http://www.huffingtonpost.com/2013/09...
http://www.npr.org/blogs/health/2012/...
http://www.nlm.nih.gov/medlineplus/en...