Sam talks to the head of TED, Chris Anderson, about using reason to build our morality. Sam makes the case that reason can indeed answer moral questions, and then explores the many controversies that emerge from that claim. Moral superiority? Cultural superiority? Moral progress? Chris and Sam dig in to discuss the right ways to think about defining right from wrong, and reason’s role in it all.

This is an episode of the TED Interview, a new podcast from TED . It’s available wherever you get your podcasts.