 Once your fingers start to prune, it's time to get out the pool. False. This is a myth. There's actually no evidence that claims pruning is bad for your skin. When your hands and feet begin to wrinkle in pools and baths, it's just your body's way of adapting to being in the water. A study once showed that it takes nearly 20% longer for dry, unwrinkle hands to move marbles than wet and wrinkle hands. So the more our hands and feet shiver underwater, the better they can grip wet objects and surfaces, like big rocks and shells. Scientists think it's evolutionary. They're rising that it could be one of the ways our ancestors were able to get by on their feet. Not totally proven, but cool nonetheless.