Wrinkled Fingers are a Evolutionary Advantage

http://www.news.com.au/lifestyle/home-garden/why-do-fingers-wrinkle-in-water/story-fneuz5ql-1226550179190

Summary: Scientists are now researching the possibility that the fact that our fingers wrinkle up when they get wet could be an evolutionary advantage. Wrinkled fingers make it easier to pick up wet objects which could have allowed some humans to easily pick up food that was located in the water. They experimented with people who had submerged their hands in warm water for thirty minutes and those whose hands were completely dry. They found that wrinkly fingers did not help to pick up dry objects, wetter objects could be picked up much faster.

Connection: Our fingers wrinkling in water is an evolutionary change. It relates well to the evolution unit and easily shows how something seemly useless can be used in many different ways. Scientists have not mentioned where or when they think this evolution occurred but it has become a trait of all humans.