Have you ever wondered why your finger pads wrinkle when they are exposed to water for a certain time? Scientists thought they had figured out the right answer – osmosis. They thought our fingers absorbed water and that caused the wrinkling process. But they were wrong.
A 2011 study showed that the wrinkling was due to a mechanism triggered by our nervous system. The study also proved that when our fingers wrinkle, it is easier to grip objects underwater. It means the wrinkling is an evolutionary response to the change of our environment.
For the rest of the story: http://www.tydknow.com/did-you-know-that-your-finger-wrinkle-under-water-because/