Many scientists say “subcritical” experiments and computer simulations make nuclear weapons testing unnecessary.

The Soviet Union detonated its first atomic bomb, known in the West as Joe-1, on Aug. 29, 1949, at Semipalatinsk Test Site, in Kazakhstan. The Soviets called their first atomic test "First Lightning." ...

you can now watch dozens of newly declassified films of U.S. nuclear bomb tests on YouTube. SEE ALSO: Doomsday-proof vault in the Arctic receives a major deposit of seeds The videos show over 200 ...