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SubiculumHammer writes:

http://neurosciencenews.com/evolution-hands-fighting-2917/
"As an alternative, we suggest that the hand proportions that allow the formation of a fist may tell us something important about our evolutionary history and who we are as a species," Carrier adds. "If our anatomy is adapted for fighting, we need to be aware we always may be haunted by basic emotions and reflexive behaviors that often don't make sense – and are very dangerous – in the modern world," says biology Professor David Carrier.

Carrier and his collaborators not only have argued our hands evolved partly for punching but that the faces of human ancestors, the australopiths, evolved to resist punching – and that human faces became more delicate as our violence became less dependent on brute force. The new study sought more experimental evidence for his theory using nine male cadaver arms purchased from the university's body donor program and from a private supply company.

Shoryuken!

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