Why do we age? And can science ever find a way to stop it? A look at one of the strangest frontiers in biology today. Jonathan Weiner is the Maxwell M. Geffen Professor of Medical and Scientific Journalism at Columbia University. He is the author of The Beak of the Finch, which won the Pulitzer Prize. His latest book, Long for This World, was a New York Times Notable Book of the Year. See the Event Website to register.