Robert Clarkのインスタグラム(robertclarkphoto) - 2月8日 08時08分

Human hands evolved so that men could make fists and fight, and not just for manual dexterity, new research finds. “Because you have higher pressure when hitting with a fist, you are more likely to cause injury to tissue, bones, teeth, eyes and the jaw,” according to David Carrier, a University of Utah biology professor. "Chimpanzees are also known to engage in raiding welfare in which one group largely eliminates a neighboring group, but this is not comparable in scope to the genocide that has characterized human history,” added Carrier. In terms of the size and shape of hand anatomy, the scientists point out that humans could have evolved manual dexterity with longer thumbs, but without the fingers and palms getting shorter.

Gorilla hands are closer in proportion to human hands than are other apes’ hands, but they and no other ape — aside from us — hits with a clenched fist. The study, published in the Journal of Experimental Biology, adds to a growing body of evidence that humans are among the most aggressive and violent animals on the planet.
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