HIROSHIMA (Reuters) - Teruko Yahata was eight when she saw a blueish-white light envelop the sky over her home city of Hiroshima one summer morning, moments before the first atomic bomb explosion ...

Hydrogen bombs cause a bigger explosion, which means the shock waves, blast, heat and radiation all have larger reach than an atomic bomb, according to Edward Morse, a professor of nuclear engineering ...

In 1949, the Soviet Union detonated its first atomic bomb at Semipalatinsk — and it didn’t stop there. Over the next 40 years ...