Pruney fingers useful? Get a grip...

摘要

Why do our fingers do prune impressions when soaked? It could be an adaptation that gives us better grip underwater. Fingers and toes wrinkle in water after about 5 minutes due to the constriction of blood vessels. This reduction in volume pulls the skin inward, but as the skin's surface area cannot change, it wrinkles. A study in 2011 showed that wrinkles form a pattern of channels that divert water away from the fingertip - akin to rain treads on tyres. The team thought that this could aid grip.