![TED Talks Daily (SD video) show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/026/759/small/tedtalks-video.png)
Summary: Why do some people do selfless things, helping other people even at risk to their own well-being? Psychology researcher Abigail Marsh studies the motivations of people who do extremely altruistic acts, like donating a kidney to a complete stranger. Are their brains just different?