The United States recently threatened military action against Syria in response to the Syrian government’s alleged use of chemical weapons. Similar threats have been made against states suspected of trying to develop nuclear arsenals such as North Korea and Iran. Yet the U.S., the U.K., France, Russia, and China have thousands of active nuclear weapons of their own. Is there a morally significant difference between nuclear or chemical weapons and conventional weapons? Should we work toward total disarmament, or do we need these weapons as a deterrent to rogue states? What steps must we take to secure peace in a world rife with weapons of mass destruction? John and Ken go nuclear with Stanford political scientist Scott Sagan, co-author of The Spread of Nuclear Weapons: An Enduring Debate, for a program recorded live at the Marsh Theater in Berkeley.