Weapons-grade nuclear material is stored at an estimated one hundred sites worldwide. Many of these sites are unsecured, leaving them vulnerable to terrorists. Leaders of 54 nations are meeting in South Korea on the second of a two-day summit on keeping nuclear material out of the hands of terrorists. But the world’s biggest nuclear concerns remain focused on North Korea and Iran, who did not attend the Summit but whose actions loom large over its participants. Diane and guests discuss the global nuclear summit and what it means for the future of worldwide security.