It happened several hundred miles away from Kwajalein ... tons of TNT or 250 times the force of the Hiroshima atomic bomb. ¶ Its mushroom cloud climbed 90,000 feet, into the stratosphere ...

It was the greatest experiment ever conducted on U.S. soil. Discover 20 little-known facts about the Manhattan project.

Photo: Atomic bomb test explosion in Alamagordo ... a new element at all but might have actually split the uranium atom in two -- at that point a barely imaginable event. Before they could ...

It was 12 September 1933. A little under 12 years later, the US dropped an atom bomb on Hiroshima, killing an estimated 135,000 people. The path from Szilard’s idea to its deadly realisation is ...