Now, this is interesting. If you have a weak stomach for gory photos, or tend to freak out when you read about diseases, click on the links with caution.
http://www.aafp.org/afp/2004/0315/p1417.html
http://www.mayoclinic.com/health/nails/WO00055
Both in the article and in the slide show the doctors are looking at fingernails, which grow faster than toenails, but toenails can also be a way to get a picture of overall health. Considering that toenails do grow so slowly, it can be a bit like looking at trunk rings to get an idea of the health history of a tree.
What an amazing tool!
Not to mention that the shape of the feet say so much about a person, their health, their state of mind and what kinds of footwear they choose.
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