Paul Ekman and his former student Dacher Keltner talk about the role of Darwin in human emotion and misconceptions about his work.
Dan Savage shares his point of view on gay adoption.
Majora Carter speaks about greening the Ghetto in her neighborhood in the South Bronx.
Paul Nicklen, photographer for National Geographic, describes his encounter with a leopard seal.
John Francis tells the story of his extraordinary life and achievements without speaking and motorized transportation at TED.
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