From the Vault: Fingernails, Part 1
Stuff To Blow Your Mind
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How Do Finger Nails Work?
Nails are composed of three layers of that fibrous composite de caritond. This is a protein found in hair and in feathers and hoofs, claws and horns. As new cells form at the base of the nail, it pushes the old nail out from the root which is why nails grow.
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