Seven TED speakers muse about the seven deadly sins: Psychologist Christopher Ryan says human beings are sexual omnivores, and a more nuanced understanding of fidelity may tamp down our shame about lust.  Oklahoma City Mayor Mick Cornett explains how his city sidestepped gluttony and collectively dropped one million pounds. Activist Dave Meslin says even though we’re apathetic about local politics, we’re hardly sloths. Dr. Gary Slutkin tracks violence, the destructive sibling of wrath. He says if we think of violence as a contagious disease, we can better contain it. Nick Hanauer is a rich guy with at least five houses, but is he greedy? He argues taxing the very rich and increasing the minimum wage would be good for everyone. Editor Parul Sehgal says literature would hardly exist without the “grim thrill” of envy. Jeopardy Know-it-All Ken Jennings reveals how losing to a supercomputer crushed his pride.