Nuclear Weapons Atom Bomb. pic: September 1968. Pictures from the detonation of the French H-bomb explosion at Mururoa, French Polynesia, showing the stages of development of the "mushroom" cloud. [Getty Images]

Nuclear Weapons, Atom Bomb, pic: September 1968, Pictures from the detonation of the French H-bomb explosion at Mururoa, French Polynesia, showing the stages of development of the "mushroom" cloud (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)