One of the great mysteries of humankind—Why do my fingers get all wrinkly during baths?—has maybe-possibly been solved. Says science: "Much like the tread on a tire, [raisin fingers] improve traction." Sure, that sounds reasonable. Apparently the nervous system controls the wrinkle response, and it has nothing to do with bloating or water absorption. [Well, BrainBehavior&Evolution, Image via Afronova/Shutterstock]