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Reposted by François Diaz-Maurin

François Diaz-Maurin @francoisdm.bsky.social · 25/09/2026

Why is the world's top nuclear nation sitting out the hype on Small Modular Reactors (SMRs)? In a new piece for @thebulletin.org, AnnaJulia Yates, Allison Macfarlane & Alexander Wimmers break down France's cautious approach to SMRs. 🧵👇

A modern industrial facility with large circular structures, green energy components, and surrounding trees, set near mountains and wind turbines. (Image: EDF)

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Reposted by François Diaz-Maurin

Bulletin of the Atomic Scientists @thebulletin.org · 28/09/2026

France's nuclear example shows that while "technologies provide easy political hype, they must prove safety, economic viability, and a clear advantage over existing low-carbon energy alternatives before major investment is justified," write AnnaJulia Yates, Allison Macfarlane, and Alexander Wimmers.

buff.ly

Why the world's top nuclear nation is sitting out the hype on small reactors

Unlike the US and UK, where start-ups and governments are betting heavily on small modular reactors, France’s state-led nuclear sector is prioritizing large-scale builds. With SMRs facing operational…

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Reposted by François Diaz-Maurin

Bulletin of the Atomic Scientists @thebulletin.org · 27/09/2026

Thomas Graham, Jr., a diplomat, arms control negotiator, and a critic of President Reagan's "Star Wars" initiative, died this month at age 92. Graham spent 27 years negotiating limits on the world's nuclear arsenals and successfully led the US effort to make the Non-Proliferation Treaty permanent.

buff.ly

Thomas Graham Jr. helped build an arms control system now under strain

Diplomat and negotiator Thomas Graham Jr., who died at 92, spent nearly three decades shaping every major US nuclear agreement and leading the effort to permanently extend the Non-Proliferation…

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François Diaz-Maurin @francoisdm.bsky.social · 25/09/2026

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François Diaz-Maurin @francoisdm.bsky.social · 24/09/2026

I give it less than 10 years for the next corruption scandal to break. If Italians banned nuclear power, it was for a reason.

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François Diaz-Maurin @francoisdm.bsky.social · 24/09/2026

Beijing views "strategic stability" as a guarantee of non-interference, while Washington pays the phrase little mind. As Donald Trump and Xi Jinping meet this week in Washington, the two leaders must move past dangerous ambiguity and define real red lines... 1/2

thebulletin.org

Trump and Xi agreed on "strategic stability." They now need to decide what it means

Beijing views "strategic stability" as a guarantee of non-interference, while Washington pays the phrase little mind. Ahead of their Washington summit, Donald Trump and Xi Jinping must move past dange...

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Bulletin of the Atomic Scientists @thebulletin.org · 23/09/2026

The US could use its acknowledgement of having space weapons as the first step in a reciprocal transparency and risk-reduction initiative. It could invite Russia and China to acknowledge a basic reality: All three nuclear powers possess systems that could interfere with or destroy space assets.

buff.ly

The US acknowledged its space weapons. Now it must build guardrails

Confirming classified space-control capabilities will not deter rivals on its own—Washington must now use this disclosure as a springboard for reciprocal transparency and risk-reduction measures…

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François Diaz-Maurin @francoisdm.bsky.social · 23/09/2026

When Presidents Trump and Xi agreed to pursue "strategic stability," Beijing called it a historic milestone. The problem? Neither power actually agrees on what the phrase means. New analysis by Tong Zhao @tongzhao.bsky.social in @thebulletin.org. 🧵👇

Leaders from the United States and China sit around a conference table with documents, flowers, and flags, engaging in a formal discussion.

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François Diaz-Maurin @francoisdm.bsky.social · 22/09/2026

Last week, the US confirmed what competitors already assumed—it has on-orbit space weapons. Russia and China immediately accused Washington of sparking an arms race, but competition in space has been underway for years. So why disclose it now? 🧵

A man in a suit stands at a podium on stage, facing an audience, with two teleprompters in front of him and stage lights shining above. (Photo by US Air Force/Malia Heemsoth)

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François Diaz-Maurin @francoisdm.bsky.social · 22/09/2026

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François Diaz-Maurin @francoisdm.bsky.social · 18/09/2026

Is the nuclear dispute with Iran entering a dangerous new phase? In @thebulletin.org, Seyed Hossein Mousavian breaks down how legal, economic, and diplomatic pressures are priming the region for war—and what a realistic off-ramp requires. 🧵

People sit in a large, circular conference room, attending a meeting at the United Nations Security Council. (UN Photo/Loey Felipe)

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François Diaz-Maurin @francoisdm.bsky.social · 17/09/2026

I thought betting platforms were bad. It's even worse.

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Robert Rust @rrucs.bsky.social · 15/09/2026

My first for @bulletinatomic.bsky.social, a deep dive on a CCTV doc about China's missile silos and thoughts on what a direct reference to the project in prominent media means for our understanding of China's nuclear thinking: thebulletin.org/2026/09/here...

thebulletin.org

Here's why China acknowledged its new missile silos in a documentary

A state media documentary featuring a PLA missile engineer provides the first semi-official acknowledgment of China's vast ICBM silo fields. By highlighting the high-level rush to complete the project...

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Reposted by François Diaz-Maurin

Bulletin of the Atomic Scientists @thebulletin.org · 15/09/2026

A state media documentary provides the first semi-official acknowledgment of China's ICBM silo fields. By highlighting the rush to complete the project, Beijing signals that this expansion is driven by a need to secure a second-strike deterrent against US missile defenses, writes @rrucs.bsky.social.

thebulletin.org

Here's why China acknowledged its new missile silos in a documentary

A state media documentary featuring a PLA missile engineer provides the first semi-official acknowledgment of China's vast ICBM silo fields. By highlighting the high-level rush to complete the…

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François Diaz-Maurin @francoisdm.bsky.social · 15/09/2026

Why did China just break its silence on its massive new ICBM silo fields? In @thebulletin.org, Robert Rust @rrucs.bsky.social breaks down a recent Chinese state media documentary that marks the first semi-official acknowledgment of the silo project. 🧵

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Joe Cirincione @joecirin.bsky.social · 14/09/2026

The American public will need many more voices and new collective efforts to erect more barriers to nuclear war, not give a president more options for starting one. Read more here 👇 END thebulletin.org/2026/09/pent...

thebulletin.org

Pentagon's secret plan: Reviving Cold War doctrines to lower the threshold for nuclear war

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Joe Cirincione @joecirin.bsky.social · 14/09/2026

Pete Hegseth's Pentagon is about to give Donald Trump several new ways to start a nuclear war. They are preparing changes in US nuclear doctrine that will blur the distinction between conventional war and nuclear war. They will develop new battlefield nukes justified by a dubious strategy. 2/13

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Reposted by François Diaz-Maurin

Bulletin of the Atomic Scientists @thebulletin.org · 13/09/2026

Drafted behind closed doors by a small group of defense officials, a new Pentagon strategy aims to expand battlefield nuclear options and blur the line between conventional and nuclear warfare—bypassing public oversight while raising the risk of unintended escalation, writes @joecirin.bsky.social.

thebulletin.org

Pentagon's secret plan: Reviving Cold War doctrines to lower the threshold for nuclear war

Drafted behind closed doors by a small group of defense officials, a new Pentagon strategy aims to expand battlefield nuclear options and blur the line between conventional and nuclear…

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Reposted by François Diaz-Maurin

François Diaz-Maurin @francoisdm.bsky.social · 11/09/2026

A secret Pentagon review is quietly laying the groundwork to lower the threshold for nuclear war, reviving dangerous Cold War doctrines. In a new analysis for @thebulletin.org, Joe Cirincione @joecirin.bsky.social breaks down what this means—and why it's a recipe for disaster. 🧵

A control room with empty chairs, large screens showing airplanes, and a radar-like red concentric circle pattern overlaying the image. (Illustration by François Diaz-Maurin; source images via National Archives and Canva.com)

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Reposted by François Diaz-Maurin

David Ho @davidho.bsky.social · 11/09/2026

When I was young, we worried about nuclear war. When I got older, we worried about climate change. Now we can worry about both.

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François Diaz-Maurin @francoisdm.bsky.social · 11/09/2026

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Reposted by François Diaz-Maurin

Sara Goudarzi @saragoud.bsky.social · 11/09/2026

Amid the tsunami of headlines claiming that AI agents went “rogue” in the Hugging Face breach, @eryk.bsky.social offers a much-needed analysis of what actually happened, and why the incident was the result of human decisions and not autonomous AI behavior.

thebulletin.org

Rogue AI didn’t breach Hugging Face, human decisions did

At the core of the Hugging Face hacking incident were a series of human choices that traded security for speed.

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Reposted by François Diaz-Maurin

Rima I Anabtawi @rimaanabtawi.bsky.social · 10/09/2026

“..the Pentagon’s thinking about space-based boost-phase systems seems geared to a world in which adversaries do not take one or more of several straightforward countermeasures. In essence, the Pentagon appears to assume the adversary will be cooperative or that the outside world is fixed.”

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Reposted by François Diaz-Maurin

Joe Cirincione @joecirin.bsky.social · 09/09/2026

Trump’s Golden Dome scam is all gold and no dome. The program gave contractors $3.2 billion to develop space interceptors that we already know can’t possibly work. There are several excellent studies out there showing why. Here’s a new one I strongly recommend. thebulletin.org/2026/09/defe...

thebulletin.org

Defeated by physics

The Pentagon's $3.2 billion bet on space-based boost-phase missile defense ignores basic orbital dynamics, offering no real protection while fueling a costly, destabilizing arms race in space.

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Reposted by François Diaz-Maurin

François Diaz-Maurin @francoisdm.bsky.social · 09/09/2026

India's nuclear arsenal is undergoing a major transformation. The new @thebulletin.org Nuclear Notebook estimates India has ~190 warheads, with rapid technological modernization across all three legs of its triad. 🧵

A large, black military submarine is partially submerged and moving through calm waters under a cloudy sky. (Photo: Indian MoD; modified)

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Bulletin of the Atomic Scientists @thebulletin.org · 09/09/2026

From computing's environmental impact to surveillance states, to AI and, yes, enshittification, the Bulletin's September magazine tackles a simple question (and breaks down the not-so-simple answers). How can we fix the internet?

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Hans Kristensen @nukestrat.bsky.social · 09/09/2026

In our latest FAS Nuclear Notebook we take a look at India’s nuclear arsenal, status & new developments. Freely available in: • PDF (@tandfresearch.bsky.social) www.tandfonline.com/doi/epdf/10.... • Web (@thebulletin.org) thebulletin.org/premium/2026... Questions, corrections, suggestions welcome.

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Reposted by François Diaz-Maurin

Bulletin of the Atomic Scientists @thebulletin.org · 09/09/2026

What went wrong with the internet, and how do we fix it? The premise of the Bulletin's September magazine is straightforward—but the diagnoses and proposed solutions are not. One thing our essayists do seem to agree on, however, is that things are getting worse.

thebulletin.org

September 2026 - Bulletin of the Atomic Scientists

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François Diaz-Maurin @francoisdm.bsky.social · 09/09/2026

🚨 Stanton Nuclear Security Fund announces new nuclear security grant opportunity The Stanton Fund has a new call for grant proposals that focus on nuclear security research. If you are at a US-based institution, you should consider applying! First-stage proposals are due by October 1, 2026.

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François Diaz-Maurin @francoisdm.bsky.social · 09/09/2026

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François Diaz-Maurin @francoisdm.bsky.social · 08/09/2026

This is an incredible achievement. It took Claude 11 days, 13 million lines, and 29,500 intermediate proofs to finally formalize the 400-year old great mystery of mathematics. This was probably out of reach to humans forever. www.anthropic.com/research/for...

anthropic.com

Formalizing Fermat's Last Theorem

Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

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François Diaz-Maurin @francoisdm.bsky.social · 08/09/2026

"And I fought during WWII like a warrior. I remember Normandy's beaches like it was yesterday."

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Sara Goudarzi @saragoud.bsky.social · 08/09/2026

"Frontier laboratories are building architecture that is centralized three times over: The same firm trains the model, owns the infrastructure it runs on, and revises unilaterally the rules for who may speak with it and on what terms," writes @allisonstanger.bsky.social for @thebulletin.org.

thebulletin.org

The AI stack’s architecture is a constitution. It’s being written without us

Civil society, not the AI industry, should write the rules for the new constitution driven by artificial intelligence.

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Reposted by François Diaz-Maurin

François Diaz-Maurin @francoisdm.bsky.social · 02/09/2026

SDI "Star Wars" collapsed in the 1980s due to physics and cost. Resurrecting space-based boost-phase defense won't yield protection—it will trigger a costly, destabilizing arms race. 6/6 Full piece in @thebulletin.org:

thebulletin.org

Defeated by physics

The Pentagon's $3.2 billion bet on space-based boost-phase missile defense ignores basic orbital dynamics, offering no real protection while fueling a costly, destabilizing arms race in space.

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François Diaz-Maurin @francoisdm.bsky.social · 02/09/2026

Can policy bypass physics? No. In @thebulletin.org, MIT physicists Lisbeth Gronlund & David Wright unpack "Golden Dome" space-based missile interceptors—and why the math simply doesn't work. 🧵1/6👇

A digital rendering of Earth shows gold geometric shapes dispersing from one side, while a gold mesh grid overlays the other half, symbolizing technological transformation or data networks. (Illustration by François Diaz-Maurin)

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Bulletin of the Atomic Scientists @thebulletin.org · 28/08/2026

Bulletin editor-in-chief Sharon Weinberger will be moderating the panel "Nuclear Legacy: Mapping Local Impacts," at Climate Desk Live this September 24th. ⬇️

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Bulletin of the Atomic Scientists @thebulletin.org · 27/08/2026

In a new article, Neta C. Crawford writes that "it is increasingly clear that the US pursuit of military preeminence directly and indirectly sacrifices environmental security and is part of the behavior that risks the survival of everyone on the planet." ⬇️

thebulletin.org

The US military’s fatal stance on climate change

The Pentagon is preparing to wage war in a warmer world, even as it accelerates it

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Bulletin of the Atomic Scientists @thebulletin.org · 24/08/2026

How much does war, and the preparation and recovery from it, contribute to the climate crisis? Neta C. Crawford's conservative estimate "shows that US and global military, military-industrial, and wartime emissions are enormous and should be factored into our understanding of global warming."

thebulletin.org

Mission impossible? Quantifying military emissions

Military and wartime emissions are difficult to track—but too important to ignore.

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François Diaz-Maurin @francoisdm.bsky.social · 21/08/2026

President Trump wants to meet Kim Jong-un again. But as Ankit Panda @nktpnd.bsky.social writes for @thebulletin.org, cutting military exercises with South Korea is the wrong opening move. To pull Pyongyang back to the table, Washington needs a strategic reboot. 🧵👇

US President Donald Trump meets Kim Jong-un at the Korean Demilitarized Zone, June 30, 2019. (Public Domain)

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François Diaz-Maurin @francoisdm.bsky.social · 21/08/2026

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Bulletin of the Atomic Scientists @thebulletin.org · 20/08/2026

A new interactive tool from the Bulletin illustrates the connections congressional officials have to defense contractors and military tech firms. Check it out here: buff.ly/WUtWi5r

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François Diaz-Maurin @francoisdm.bsky.social · 19/08/2026

According to the latest @scientistsorg.bsky.social estimate, NK may have produced enough fissile material to hypothetically build up to 90 nuclear warheads, but has likely assembled fewer than that—potentially around 50 for delivery primarily by medium-range ballistic missiles.

thebulletin.org

North Korean nuclear weapons, 2024

North Korea continues to modernize and grow its nuclear weapons arsenal. We estimate that North Korea may have produced enough fissile material for up to 90 nuclear warheads, but has likely assembled ...

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