Geoff Brumfiel

Earlier this year, Russian President Vladimir Putin claimed his nation had successfully tested a nuclear-powered weapon. Satellite imagery suggests it may not have gone so well.

North Korea had already promised to dismantle part of the site. Now, with fanfare, it's offering to let the world watch — which analysts say is not that much of a step forward.

Russian agents were allegedly planning to hack into a Swiss laboratory that was analyzing nerve agents used in March against a former Russian spy and his daughter.

Vice President Pence unveiled the Pentagon's plans for a branch of the military that could fight in space on Thursday.

The president wants a "separate but equal branch" of the military to watch over the final frontier, but only Congress can make it happen.

The president boasted Tuesday of a bonus "favor" from Kim Jong Un, but experts say it might not mean much without independent verification.

Journalists observed as North Korea blew up tunnels it uses for nuclear testing. But experts say it was mostly for show, and closing the site will have little impact on the nation's capabilities.

The reactor could keep the lights on during long-duration missions far from Earth.

Former inspectors say documents obtained by the Israeli government may prompt a fresh look at the nation's nuclear sites.

An international inspection team has been waiting for nearly a week to investigate an alleged strike in Syria. Former inspectors say the delay will complicate their efforts.

The administration's Nuclear Posture Review mentions a massive, nuclear-armed torpedo capable of incinerating cities. But is it real?

The Trump administration appears close to finalizing a review of the nation's nuclear posture. It calls for the U.S. to develop new nuclear systems and capabilities at a time of heightened tensions between America and other world powers.

It took decades, but John Coster-Mullen has pieced together specs for America's first nuclear bombs. Some believe his odyssey says something about North Korea's rapid nuclear progress.

It flew higher — and for longer — than previous tests, theoretically putting the entire continental U.S. within Pyongyang's reach — a capability that the North Korean regime has long sought.

A fire at a chemical plant near Houston has raised concerns about the environmental consequences of the storm.

Texas and Louisiana are steeling for more rain from now tropical storm Harvey. Rising temperatures factored into the size and impact of the storm.

Carhenge in Alliance, Neb., will be prime viewing for this month's total solar eclipse. The town is preparing for thousands of visitors.

On Wednesday, President Trump tweeted that he modernized the U.S. nuclear arsenal as his first act in office. But others question that claim. NPR takes a closer look at America's nuclear capabilities.

North Korea's government and President Trump have traded threats after North Korea's recent missile tests. And Hadas Gold of Politico discusses pro-Trump news videos on the president's Facebook page.

The Defense Intelligence Agency has concluded, according to The Washington Post, that North Korea has successfully miniaturized a nuclear warhead. Many in the open source nuclear weapons community agree.