The ‘Dark Bright Spot’ in the Iran Nuclear Debatebr Commonwealth Club - Mark Hopkins Hotelbr Three distinguished statesmen, Secretaries Shultz and Perry and Senator Nunn, discuss their vision for international security in these precarious times. They assess the current state of nuclear threats, including Iran's drive to build a bomb, the North Korean nuclear weapons program, and future prospects for limiting the spread of nuclear materials and eventually eliminating nuclear weapons.