Reader's Digest answered that for us in their May 2013's issue:
Did You Know... WhyWe Get Pruney Fingers In Water?
Thank your primate ancestors for those wrinkly digits in your bath. Pruney fingers provided a better grip for wet objects, so they may have evolved to give humans an advantage in gathering food in the rain, British researchers at Newcastle University reported in the journal Biology Letters. The scientists, who studied how quickly participants could move wet versus dry marbles, found that people with dimpled fingertips were about 12 percent quicker at moving wet objects, according to the New York Times.
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