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A Finger With Nerve Damage Doesn’t Wrinkle

As you can see, this person’s middle finger isn’t pruney like the rest of the fingers, because it has nerve damage! This is known as the “skin wrinkle” test. A finger with nerve damage doesn’t wrinkle underwater.

 Scientists used to think that fingers and toes prune up because of osmosis, but this disproved it! Instead, our fingers and toes wrinkle up underwater to improve our grip on wet or submerged objects!

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