So everybody thinks that pruned hands come from water seeping into the skin, it is actually nerve response. It allows the skin to wrinkle. But why would humans have that? Well many experiments were executed and supplied the solution that wrinkled hands/fingers transport wet objects much more inefficiency then the standard hand form. Branching off of the hand wrinkles it is also believed that the toes also wrinkle because they would supply sure footing on slick surfaces. This find brings us into touch with our past and creates an interesting window into why our hands get super gross every time we go swimming.
http://www.sciencenews.org/view/generic/id/347439/description/Pruney_digits_help_people_get_a_grip
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