Bulletin of the Atomic Scientists

The future of the Iran conflict remained nearly as murky after President Trump's address as it was before. That's also true of the status of possible secret Iranian chemical and biological weapons programs, write Christina McAllister and Richard T. Cupitt. thebulletin.org/2026/04/what-s…

As the Trump administration considers new policies for gain-of-function research, scientists have an important role to play in evaluating risks and benefits—but only with a commitment to fair and rigorous evaluation, writes Thomas Kelly. thebulletin.org/2026/04/the-ke…

"If Earth were the Titanic, we’d be looking for the lifeboats. But there are none on this lonely, isolated planet." thebulletin.org/2026/03/unders…

"Ehrlich’s commitment to science, his willingness to sound the alarm, his teachings that reached & influenced thousands of today’s scientists and activists, have made it possible to see and work for a better future." thebulletin.org/2026/03/unders…

The death of biologist Paul Ehrlich on March 13 generated a flurry of commentary, most of it insufficiently attentive to his contributions to science & raising awareness of environmental threats, write Michael E. Mann, Peter Gleick, & John P. Holdren. thebulletin.org/2026/03/unders…

Our senior advisor, Kennette Benedict, went on @TheUC3P podcast Root of Conflict to talk about The New Nuclear Age. Listen here: open.spotify.com/episode/3tKsZ1…

Journalists, filmmakers, and content creators: Join us at the @OutriderFdn Nuclear Media Summit in Los Angeles on October 22–23! 🔗 Apply now: buff.ly/J2UG86H

This analysis would mean the enrichment vaults at Natanz & Fordow were probably empty before the June strikes, raising questions as to whether there is any enriched uranium “under the rubble” at facilities the Trump admin claimed it “obliterated” in June. thebulletin.org/2026/03/analys…

Join the Bulletin and the Chicago Council on Global Affairs today at 5:30 pm CT for a discussion on nuclear power, geopolitics, and energy security. globalaffairs.org/events/nuclear…

Join the Bulletin and the @ChicagoCouncil today for a discussion on nuclear power, geopolitics, and energy security. Learn more and register here: globalaffairs.org/events/nuclear…

"In my assessment, the material seems most likely to have been highly enriched uranium (HEU) in the form of uranium hexafluoride (UF6),[2] and the quantity could be up to about 540 kilograms, more than previously reported by the IAEA and Iran." thebulletin.org/2026/03/analys…

Satellite imagery shows that Iran could have transferred to Isfahan up to 540 kilograms—possibly all—of its highly-enriched uranium inventory before the June strikes last year. thebulletin.org/2026/03/analys…

In 2025, the Bulletin celebrated its 80th year. Read our newly released annual report to see some of the highlights. thebulletin.org/about-us/annua…

"Before trading one illusion of security for another, Nordic countries should check their threat perceptions [...] that might reveal the real need is not for more deterrence but for a strategy to manage the associated escalation risks." thebulletin.org/2026/03/the-mi…

"During active combat, the hackers didn’t choose an aviation manufacturer or an oil company; they chose the health care sector." thebulletin.org/2026/03/from-m…

Calling rising experts with big ideas - submit your writing to the Bulletin! thebulletin.org/next-generatio…

"The infrastructures that sustain modern life are simultaneously vulnerable to biological risk and digital exploitation." thebulletin.org/2026/03/what-c…

"The Russian war against Ukraine has opened a Pandora’s box of emerging threats to the international world order." thebulletin.org/premium/2026-0…

Measures meant to mitigate human-made biological risks remain anchored in conceptual frameworks like arms control agreements and export controls. Filippa Lentzos and Tim Stevens argue that they may do better by looking toward cybersecurity. thebulletin.org/2026/03/what-c…

"Bethe and Garwin did not mislead their audiences, they weren’t hypocrites, and they didn’t act corruptly in their roles as government advisors." thebulletin.org/2026/03/sensel…