Radioactive materials are found naturally in the Earth. But even so, saying an area is radioactive can conjure up images of ...

A chilling map from the 1980s shows how up to 75% of the US could be wiped out in a nuclear war, with scientists using a ...

Just days earlier, North Korean leader Kim Jong Un vowed to expand his country's nuclear arsenal, currently comprised of roughly 50 nuclear warheads. According to the Stockholm International Peace ...

It’s a pivotal moment for nuclear weapons. Tensions between the United States and Russia, the two major nuclear powers, are high. Longstanding nuclear pacts have crumbled. China, which trails ...

The U.S. hasn't tested a nuclear weapon in decades, and since the 1990s has used simulations and experiments to verify they're working properly. NPR was granted a rare look at how they do it.