The Energy Department and Air Force in August successfully carried out the first tests dropping unarmed B61-12 nuclear ...

We asked Professor Paul Bracken, an expert in nuclear strategy, what’s behind the posturing and what test explosions would mean for the world.

The U.S. altered the course of history 80 years ago when it dropped the atomic bomb on Japan. It was an audacious move that ultimately led to the end of World War II. The motivation and secrecy ...

The First Quebec Conference, 1943: (clockwise from top left) Mr Mackenzie King, Winston Churchill, Alexander Cambridge, Earl of Athlone, and President Roosevelt - Bettmann Manhattan, Mayson, Maud. One ...

HARRY S TRUMAN: A short time ago, an American airplane dropped one bomb on Hiroshima and destroyed its usefulness to the enemy. That bomb has more power than 20,000 tons of TNT. SIMON: It was an ...

(Corrections & Clarifications: This story previously misstated how far nuclear fallout from the government's atomic tests reached. Fallout from the initial Trinity Test reached 46 of the 48 contiguous ...

President Donald Trump’s comments Thursday suggesting the United States will restart its testing of nuclear weapons upends ...