David Carrier is an evolutionary biologist at the University of Utah. Last fall, he co-authored a paper that argued the human fist evolved for fighting. He and his team were caught off guard by the controversy it generated.
Special Thanks To:
Factum Cross Fit and MMA, (Eric Wahlin)
Music: God Speed You! Black Emperor, Slow Riot for New Zero Kanada
For a full list of image and video credits, click here