This report draws on a series of international workshops held to mark the fiftieth anniversary of President Dwight D. Eisenhower's Atoms for Peace address before the United Nations General Assembly. A half-century after President Eisenhower's landmark speech, the world is vastly different, but mankind still faces the challenge he identified--gaining the benefits of nuclear technology in a way that limits the risks to security. Fifty years after Eisenhower declared that the people of the world should be 'armed with the significant facts of today's existence,' the consequences of his bold vision should be evaluated to provide a foundation upon which to shape the next fifty years. Policy and technology communities cannot escape the legacy of a half-century of nuclear technology expansion. At the same time, citizens need to consider the future role of military and civilian nuclear technology in a global strategy to meet the challenges of the twenty-first century. The new century brought with it a set of contradictions regarding nuclear technology. Nuclear knowledge, technology, materials, and facilities have spread around the world, but control and management of the nuclear genie have not kept pace.