The 80th anniversary of the atomic bombing of Hiroshima and Nagasaki is this week. It was the only time nuclear warheads were used during war. Here’s a look at the history and current U.S. stockpile.

North Korea warned this week that it might test a hydrogen bomb in the Pacific Ocean, after saying the country had already successfully detonated one. A hydrogen bomb has never be ...

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 ...

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