why fingers and toes wrinkle scientificamerican.com Scientific American Scientificamerican.com adaptation to improve our grip in wet conditions give you better grip realized in the 1930s scientificamerican.com/article/… make it harder to feel sensations make it harder to feel sensations SA pruney fingers. Scientific American Scientificamerican.com make it harder to feel sensations wrinkly fingers, in wet conditions, are just like snow tires Scientific American scientificamerican.com Scientific American January 9, 2013