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b'One of the things that makes humans, well, human is the ability to make a fist. Other primates can\\u2019t do this. The commonly accepted theory as to why humans developed the ability to make a fist is that they needed to do so in order to grasp tools.\\nBut research conducted by my guests today have led them to posit a very different theory. They argue that the reason we can make a fist is so we can give better knuckle sandwiches.\\nTheir names are Dr. David Carrier and Dr. Michael Morgan. Today on the show, we discuss that idea and the theory that human bodies, especially male bodies, evolved for fighting.'