Forty years after Chornobyl, more nuclear disasters are inevitable — plan for them Civil nuclear technology comes with unlikely but dangerous risks that shouldn’t be overlooked.

"Regulatory backsliding in the United States over the past 15 months will only increase risks of nuclear accidents."
@atomicbell.bsky.social
www.nature.com/articles/d41...

Trump's 'a whole civilization will die' threat against Iran exploits long-standing ambiguity over what Washington considers legal in war "These developments unfold within a broader context marked by a significant—and deeply troubling—erosion of international humanitarian law."

President Trump's latest ultimatum promising massive infrastructure strikes on Tuesday night confirms that the international community may face a stark escalation in the war in Iran, write @alialkis.bsky.social and @ludovicacast.bsky.social.

What should be done about Iran's potential secret chemical and biological weapons programs? The future course of the Iran conflict remained nearly as murky after President Donald Trump's address as it was the previous day. That's also true of the status of possible secret chemical and…

The future of the Iran conflict remained nearly as murky after President Trump's Wednesday address as it was before.

That's also true of the status of possible secret chemical and biological weapons programs that have received scant attention, write Christina McAllister and Richard T. Cupitt.

"The authors align themselves with a specific in-group: climate expert, scientist, activist, influencer, or environmentalist. Once the author has assumed the mantle of group representative, he or she proceeds to undermine, denigrate, or renounce the efforts of that group."

What can biosecurity learn from cybersecurity? A lot. Measures meant to mitigate human-made biological risks remain anchored in conceptual frameworks like arms control agreements and export controls. These are increasingly misaligned with the challenges ...

Biosecurity still thinks like nuclear policy. But today’s risks look like #cyber: persistent, distributed, hard to attribute. We need resilience, continuous monitoring, risk management--not just prevention. My latest with @warstudieskcl.bsky.social colleague @tcstvns.bsky.social

Satellite view of a tunnel entrance with a blue truck, several smaller vehicles, and surrounding sandy terrain.

Here's why I believe Iran could have transferred to Isfahan up to 540 kilograms—possibly all—of its highly-enriched uranium inventory before the June strikes last year. 👇

#Iran #nuclearweapons #uranium #OSINT #nukesky

From medicine to ambulances, how the Iran war is exposing US health care vulnerabilities With tactics ranging from choking off trade in drug ingredients in and around the Strait of Hormuz to launching a cyber attack on a company making systems for ambulances, Iran and its allies are…

With tactics ranging from choking off trade in drug ingredients in and around the Strait of Hormuz to launching a cyber attack on a company making systems for ambulances, Iran and its allies are exposing how vulnerable the US health care system is.

NIH modernization could expose biosafety gaps "Biosafety modernization should refine and extend the architecture brought about by NIH’s venerable guidelines, not replace it."

If NIH prioritizes human-based science in its ongoing overhaul of biosafety policies, the oversight system that has evolved for review of a wide-swath of biological research could atrophy, write biosafety experts David Gillum, Megan Shoff, and Randy A. Albrecht.

@nytimes.com / @washingtonpost.com in case you run out of ideas about this war. (I'd eagerly trade one of your explainers for this reporting)👇

AI social platforms like Moltbook are potential accelerators of existential risk that should be regulated as critical infrastructure AI social networks are where agents can compound their capabilities and coordinate at scale—and in which humans can lose control.

How AI agents on social media and hooked up to the real world could brew an existential crisis, or at least a lot or propaganda, cybercrime, and economic chaos. @thebulletin.org
thebulletin.org/2026/03/ai-s...

Unready for war, AI may already be causing deadly mistakes Gary Marcus discusses if the strike on a school in Iran stems from the use of artificial intelligence in the war.

"It’s easy to see how an AI system might have had access to old intel and new intel and failed to give precedence to the new information. This is especially true if the old intel was more represented in the AI training data set...," writes @garymarcus.bsky.social of the strike on a school in Iran.

The Fukushima nuclear energy plant disaster 15 years ago continues to devastate humans and the environment

"In the forested hills that ring the coast, there is no way to lessen Fukushima’s radioactivity other than to wait out the half-life of cesium 137, which is 30 years."@thebulletin.org

I wrote this last night.

The military escalation against Iran's nuclear sites has led to a complex tactical and political stalemate for the US administration. Here's a breakdown: 👇 - 1/10

Fukushima at 15: Living with radioactive hot spots and stigma as Japan's government pushes for more reactors Fifteen years later, the lived experience of people resettling the evacuation zone reveals an ongoing disaster at Fukushima—one filled with radioactive hot spots, injustices, and stigma.

🚨 JUST IN: Fifteen years later, the lived experience of people resettling the evacuation zone reveals an ongoing disaster at Fukushima—one filled with radioactive hot spots, injustices, and stigma.

This story was supported by the @pulitzercenter.org.

#Fukushima #nukesky @thebulletin.org

France has a new nuclear doctrine of ‘forward deterrence’ for Europe. What does it mean? With his calibrated speech, Macron projected a more assertive French nuclear deterrence in Europe without abandoning the national tradition of restraint.

"France seems to be prepping itself for a more aggressive nuclear age." Héloïse Fayet writes, after Macron talks about France's nuclear weapons doctrine. @thebulletin.org
thebulletin.org/2026/03/fran...

War in Iran: Views from the ground As war escalates in the Middle East, videos are being shared by those people experiencing missile and drone attacks firsthand.

@thomas.gaulk.in compiled social media footage from all around the Middle East. The effect of war footage is different when you see it all put together like this. @thebulletin.org
thebulletin.org/2026/03/war-...

"You cannot bomb a country into regime change and expect freedom and democracy and human rights to flourish."
— Kevin Maguire (@kevmag.bsky.social)

Here's why 👇

Trump wants regime change in Iran. History suggests that could lead to a long, complicated struggle President Donald Trump hopes for a quick resolution to the war in Iran followed by a new, US-friendly regime there. Joint US-Israeli airstrikes have already killed Iran's supreme leader, but history…

President Trump wants a regime change in Iran.

"As history shows, when it comes to forcibly changing the government of a foreign adversary, an initial victory can frequently be illusory," writes Bulletin editor Matt Field @mattyfield.bsky.social.

The Strategic Challenges of the US Military Campaign Against Iran US President Donald Trump has called for regime change, the destruction of Iranian military capability, and the degradation of proxy groups. But an operation with multiple goals carries greater risk.

Bulletin Senior Advisor Rachel Bronson @rb312.bsky.social writes for the Chicago Council on Global Affairs @global-affairs.bsky.social on the strategic challenges of the US military campaign against Iran.

President Trump just started a dangerous, pointless war against Iran The war is not the result of deliberations or consultation. It is the impulsive decision of one man—like dictators do.

@joecirin.bsky.social list of criticisms is long. A few points:

"Iran does not pose an imminent threat."

"Active negotiations showed promise this week."

"No US ally, save Israel, supports this war."

"Innocent civilians in Iran and the region will die needlessly." @thebulletin.org

Trump’s war on Iran: grave dangers and, at best, limited benefits As with the 2003 Iraq war, the path to conflict with Iran has been paved with false statements. Pandora’s box is now open: The consequences of the US and Israeli attack on Iran will be lasting but are...

Iran's nuclear program, "obliterated" last summer, probably hasn't been advanced by much. Regime change by air has a record unbroken by "success." Matthew Bunn writes about these and other reasons to doubt the rationales for and likely efficacy of Trump's new war on Iran. @thebulletin.org

Anthropic’s showdown with the US Department of War may literally mean life or death—for all of us Why the showdown between Anthropic, a major developer of artificial intelligence models, and the US Department of War lead to existential-level catastrophe.

Pete Hegseth playing tough guy with AI companies. What could possibly go wrong? thebulletin.org/2026/02/anth...

'Agentic' life sciences AI is exacerbating bioweapons concerns. Here's what to do about it Biosecurity experts have repeatedly raised concerns about the convergence of AI with the life sciences. Agentic AI systems that combine the capabilities of large language models (LLMs) and specialized...

New far more capable AI systems for the life sciences are coming online. These "agentic" systems could carry more risks than already exist with AI. Sarah R. Carter writes "it will be critical to build biosecurity measures into these systems from the beginning." @thebulletin.org

Assad loyalists are regrouping. The world should help the new Syrian government destroy leftover chemical weapons—now Remnants of former Syrian President Bashar al-Assad's regime are reorganizing and rearming in a country with ample stock of leftover chemical weapons. Even a single successful chemical attack by Assad...

There are still a lot of chemical weapons left in Syria. @gregkoblentz.bsky.social writes about how to deal with them during a perilous moment for that country's new government. @thebulletin.org thebulletin.org/2026/02/assa...

Russia calls it the ‘nonsense with a frog.’ The Navalny assassination is actually another chemical weapons violation Russian opposition leader Alexei Navalny was poisoned with a toxin naturally found on the skin of South American frogs. His assassination was yet another violation of the international ban on…

Russian opposition leader Alexei Navalny was poisoned with a toxin naturally found on the skin of South American frogs.

His assassination was yet another violation of the international ban on chemical weapons, writes Gemma Bowsher.

And today, German Chancellor Merz said in the opening of the conference that he is talking with French President Macron about European nuclear deterrence.

Why Iran–US negotiations must move beyond a single-issue approach to the nuclear problem If the negotiations scheduled for Friday between Iran and the United States are to be effective and durable, they must move beyond a single-issue on nuclear weapons and toward a comprehensive, direct,...

A worthy read ahead of US-Iran talks tomorrow, written by a former chief of Iran’s National Security and Foreign Relations Committee. @thebulletin.org
thebulletin.org/2026/02/why-...

The experts comment: New START expires, bringing both risks and opportunities Experts share their concern about the no-rules, no-inspections period that opens when New START expires on Thursday. They also see an opportunity to adapt arms control to a multipolar world.

"If it expires, it expires. We’ll do a better agreement," Trump said of the last nuclear arms agreement between the US and Russia. Experts are a bit less blasé about the demise of New START. @thebulletin.org
thebulletin.org/2026/02/the-...

Trump Scrambles to Clean Up Mess in Minneapolis, Calls Protesters Paid Agitators & A Snow Day Prank! YouTube video by Jimmy Kimmel Live

Jimmy Kimmel always knows what time it is. @thebulletin.org youtu.be/FWjnx_zkD70?...

🚨 It is now 85 SECONDS TO MIDNIGHT on the #DoomsdayClock, the closest it has ever been to midnight.

Learn why here:

thebulletin.org/doomsday-clo...