Maybe the reason human hands are shaped the way they are isn't just so we can use a bottle opener after all. In a new study, biology professor David Carrier at Salt Lake City's University of Utah has posited that the reason our particular hand shape evolved wasn't primarily so we could use tools — other hand shapes would have still enabled us to do that — but to punch the living daylights out of each other. Carrier says we're the only primates who can form a fist with our thumb on the outside of our fingers, which packs more of a punch. Just ask a shark. [Source]
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