text:  Our audio engineers were Neil T. Vault, Robert Rodriguez, Gilly Moon, and David Greenberg. Our theme music was written by Ramtin Arablui. Our partners at TED are Chris Anderson, Roxanne Heilash, Alejandra Salazar, and Daniela Ballarezzo. I'm Manoush Zomorodi, and you've been listening to the TED Radio Hour from NPR.