Why Do We Wrinkle When We Get Wet? [VIDEO]

I have found a video that explains a question that is as old as what came first the chicken or the egg? Why do we wrinkle when we get wet?  

If you have ever spent long periods of time in water then your fingers and toes have wrinkled. You probably even have asked yourself why? Why do we wrinkle when we get wet? This video has the answer to that question.