Preview: After Newtown, A Two-Part PBS Special

Part 1: Gwen Ifill anchors After Newtown, featuring contributions from PBS NewsHour, FRONTLINE, Washington Week, NOVA and Need to Know. The show addresses such issues as access to guns and the politics of gun laws; mental illness in young adults; the science of detecting violent impulses; and how communities react to unspeakable tragedy. Part 2: PBS continues its coverage with a live broadcast.