The Why Files on MSN

A 15-megaton nuclear blast – and the fear of nuclear war

During the Cold War, the world prepared for nuclear war. In 1954, the United States detonated a 15-megaton nuclear bomb at Bikini Atoll — 1,000 times more powerful than Hiroshima. Entire islands were ...

These are the safest countries in Europe if a nuclear war breaks out — but there’s a catch

While some states may not be in the crosshairs, no state would be completely immune to the effects of a nuclear blast, with radiation in the atmosphere.
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Nuclear weapons tests: The physics that makes them so hard to hide

Nuclear weapons tests are among the most violent events humans can trigger, and that violence leaves fingerprints in the Earth, sea, air, and even in orbit. The physics of shock waves, sound, and ...