Find out just how close the Nazis came to building atomic weapons during World War II, and view the only known diagram of a German nuclear bomb.

Nearing a Nazi bomb. Uranium machines needed a moderator, a substance that would slow down the neutrons liberated by chain reactions. In the end, the project decided to use heavy water—oxygen ...

Last week, the Russian nuclear energy agency, Rosatom, released a 30-minute, formerly secret documentary video about the world’s largest hydrogen bomb detonation. The explosive force of the ...

The atomic age dawned at 5:30 a.m. on July 16, ... The bomb vaporized the 100-foot tower it had been hoisted into for the test, ... repeating structure like a brick wall or a lattice.