Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.

A subsurface atomic test near Yucca Flats, Nev., in March 1955. (U.S. Atomic Energy Commission via AP) In what would be a major shift in a decades-old American policy against global nuclear ...

President Trump's comments about restarting weapons tests are not likely to lead to mushroom-cloud explosions over the New Mexico desert or seismic shaking underground in Nevada, according to the ...

“With others doing testing, I think it’s appropriate that we do also,” Trump said aboard Air Force One as he was returning to Washington. He said nuclear test sites would be determined later, and ...

The decision could have huge ramifications. The U.S. hasn't conducted such a test in decades. MARTÍNEZ: So how would a test like that be done? Let's ask NPR science and security correspondent Geoff ...

"We've halted many years ago, but with others doing testing I think it's appropriate to do so," the president told reporters aboard Air Force One. Experts say that the resumption of testing would be a ...