Authorities working with the FBI have interrupted four attempts in the past five years by gangs with suspected Russian connections that sought to sell radioactive material to Middle Eastern extremists.

A five part exploration of the Cold War's effect on video games.

On Thursday, in a teleconference sponsored by the Bulletin of the Atomic Scientists, nuclear weapons expert Henry Sokolski discussed his recent book "Underestimated: Our Not So Peaceful Nuclear Future." The book's central thesis is that if "states become more willing to use their nuclear weapons to achieve military advantage … US security may become hostage to nuclear proliferation" and a number of other dangers.

North Korea said on Tuesday that it was improving its nuclear arsenal in both “quality and quantity,” reaffirming that the country’s main nuclear complex, including its only disclosed uranium-enrichment plant, was in full operation. North Korean scientists and engineers have made innovations “to guarantee the reliability of the nuclear deterrent in every way by steadily improving the levels of nuclear weapons with various missions in quality and quantity,” the state-run Korean Central News...

A $50 million security system at the Y-12 nuclear complex that stores fissile material for 10,000 nuclear bombs is still malfunctioning

At a time when the Iran agreement is in the headlines and other Middle Eastern countries—notably Saudi Arabia—are making noises about establishing their own programs for nuclear energy and nuclear weapons, it is worth giving renewed scrutiny to an event that occurred 36 years ago: a likely Israeli-South African nuclear test over the ocean between the southern part of Africa and the Antarctic.

U.S. nuclear weapons can be launched in under 2 minutes. Does that really make us safer?

A secret 50-year-old memo to the British prime minister solved this Cold War mystery. But could a similar event happen again today? Richard Hollingham investigates.

With several long-range ballistic missiles in development, the Indian nuclear posture is entering an important new phase.

A group of nearly 200 retired generals and admirals sent a letter to Congress on Wednesday urging lawmakers to reject the Iran nuclear agreement, which they say threatens national security. The letter is the latest in a blizzard of missives petitioning Congress either to support or oppose the agreement with Iran, which would lift sanctions if Iran pared back its nuclear program.

Recent developments—Russian aggression in Ukraine, China’s expanding territorial claims, and the need to modernize the US nuclear arsenal—have caused scholars to revisit a labyrinthine world of nuclear strategy largely neglected since the end of the Cold War. But this new wave of theory has resurrected some dubious arguments. In recent months, a number of strategists have argued that the United States needs to develop a new generation of low-yield nuclear warheads to deter its adversaries...

Sendai nuclear plant in southern Japan is first to begin operation since 2011 Fukushima meltdowns, despite anti-nuclear protests

We’ve all seen the stories about the Iran nuclear deal, which was concluded on July 14 between Iran, Britain, China, France, Russia, Germany, the United States and the European Union. What does it really mean for U.S. and global security?

When Atsushi Hoshino set out to revive a group representing atomic bomb survivors in the rural northeast Japanese prefecture of Fukushima 30 years ago, one topic was taboo,criticizing the nuclear power industry upon which many relied for jobs

Seventy years ago, the flash of a nuclear bomb illuminated the skies over Alamogordo, New Mexico. What did it look like? By Alex Wellerstein.

Thanks to the CTBTO for helping keep the world safe by detecting secret nuclear tests.

He fused the atom at 14, has advised the US government on counter-terrorism and plans to beat cancer – and he’s still only 21. What scares Taylor Wilson? Asking a girl for her number... (June)

Why don't we have nuclear fusion power yet? Because it involves taming plasmas at temperatures far hotter than the Sun's core. But the good news is that physicists are slowly but surely figuring out how.

NEWS ANALYSIS: Lockheed Martin's Skunk Works claims the ability to generate cheap energy from nuclear fusion with little waste or global warming is within its grasp.

North Korea appears poised to expand its nuclear program over the next five years and in a worst case scenario could possess 100 atomic arms by 2020, US researchers warned today. And cutting-edge European companies could be unwittingly contributing to Pyongyang's suspect nuclear program with their equipment diverted to the isolated country via China, they said. Unveiling the first results of what will be a 15-month study, Joel Wit, senior fellow at the US-Korea...