Twenty years ago, U2 showed us how to take apart an atomic bomb - or at least their album title suggested as much. The Dublin rock band's album "How To Dismantle An Atomic Bomb" couldn't be more ...

U2 is marking the 20th anniversary of their 2004 album, How To Dismantle An Atomic Bomb, with its shadow album, How To Re-Assemble An Atomic Bomb, and it comes with previously unreleased tracks ...

Photo: Atomic bomb test explosion in Alamagordo, New Mexico, July 16, 1945. AP/Wide World Photos In 1932, James Chadwick discovered the neutron, a small atomic particle with mass but no charge.