Podcast: Supergenes, a New Longevity Diet, and Historic Bowel Movements By David Grimm, Sarah CrespiMar. 6, 2014 , 4:45 PM How does a supergene help a butterfly outwit a predator? Could a low-protein diet be the key to longevity? And what does 700-year-old human poop reveal about the evolution of our gut bacteria? Science's Online News Editor David Grimm chats about these stories and more with Science's Sarah Crespi. Listen to the full Science podcast. Hear more podcasts.