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.

A thousand feet beneath the desert, the United States conducts experiments to verify that its weapons work. But some fear a ...

Satellite images reveal China is building a massive laser fusion facility, which can be used in nuclear weapons research as ...

China is constructing a massive laser-ignited fusion research facility in Mianyang, with a structure resembling the U.S.

Satellite images reveal China's secretive nuclear fusion research facility in Mianyang, raising concerns about its potential ...

China’s Experimental Advanced Superconducting Tokamak (EAST) has set a new world record maintaining steady-state ...