The hallmark of a productive debate is not persuasion, but insight. So says Adam Grant in this wide-ranging conversation with John Donvan and Intelligence Squared CEO Clea Conner. A good argument is not only about convincing, Grant explains, but also to learn. In his new book, Think Again, Grant explores a set of cognitive skills that might matter more than pure aptitude: The ability to rethink and unlearn. That is the focus of this conversation; the capacity to change your mind, and why it matters more than ever.