Since George W. Bush first declared a "war on terror," the US has been engaged in a global campaign to rid the world of terrorists. But what exactly is a “terrorist,” and how do we distinguish illicit terrorist organizations from legitimate freedom fighters? Do terrorists exhibit particular psychological patterns of behavior, or are there some tactics that only terrorists use? And what is the most effective way to combat terrorism – by waging war, engaging in "de-radicalization" processes, or some other means? John and Ken agree to negotiate with Stanford political scientist Martha Crenshaw, author of Explaining Terrorism: Causes, Processes, and Consequences, for a program recorded live at the Marsh Theatre in Berkeley.