For perspective on the president's nuclear summit and the movement to cut weapons stockpiles around the world, Jim Lehrer speaks to summit organizers, former Secretary of State Madeleine Albright and former National Security Advisor Brent Scowcroft.

The Obama administration has rolled out a new roadmap for limiting American nuclear arsenals and promoting the goal of a nuclear-free world. Jeffrey Brown gets two points of view on arms control from nuclear experts.

In a move that could end what has long been viewed as the primary obstacle to the full implementation of a political peace deal in Northern Ireland, the IRA has destroyed its vast arsenal of weapons, independent monitors announced Monday.

By PBS News Hour