Joseph Cirincione is on the line this week. The nuclear policy wonk and activist discusses Iran, Bush's troubled non-proliferation record and why the jury is still out on President Obama's nuclear legacy. He tells Mark about his first memories of living under the threat of nuclear war and how his life and career has tracked the ups and downs of American nuclear policy. It's timely conversation, kicked off with a brief discussion of the Iran nuclear talks, and a timeless conversation about the history of America and the bomb. Enjoy!