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Description: David Carrier is an evolutionary biologist at the University of Utah. Last fall, he coauthored a paper that argued the human fist evolved for fighting. He and his team were caught off guard by the controversy it generated.nnSpecial Thanks To:nThe Phoenix Gym, http://www.thephoenixgym.com/nFactum Cross Fit and MMA, http://www.factumutah.com/ (Eric Wahlin)nThe Good Line, http://thegoodline.com/nnMusic: God Speed You! Black Emperor, Slow Riot for New Zero Kanada, https://www.youtube.com/watch?v=2c9