🚨 JUST IN: A newly declassified cable reinforces proliferation concerns about high-assay low-enriched uranium fuel, and reveals an urgent need for an international review of #HALEU use, writes Ed Lyman (@nucsafetyucs.bsky.social). #uranium #enrichment #proliferation #IAEA #safeguards #nukesky

My colleague @lauraegrego.bsky.social is doing a Reddit "Ask Me Anything (AMA) on #AHouseofDynamite. She is answering a house-full of compelling questions with aplomb. You can take a gander - and add your own questions - here:

My brilliant @ucs.org colleague Chanese Forté interviews two other brilliant folks, Dr. Jan Beyea, and @nucsafetyucs.bsky.social, on the Trump administration's moves to undermine sensible, science-based limits on radiation exposure. Team Trump seems to wants to promote nuclear power at any cost.

The end of the Oil Age won’t come from scarcity — it’ll come from irrelevance. Solar, wind, and batteries aren’t waiting for permission; they’re simply better. When the new paradigm outperforms the old on cost, speed, and resilience, history doesn’t argue — it moves on. #EnergyTransition #BESS #EV

1 in 8 Americans did not receive their monthly food benefits on Saturday, despite evidence and two judicial rulings affirming that the Trump administration can and should use the contingency funds for these benefits. Tell them to put politics aside and fund SNAP now. act.ucsusa.org/47y8Hta

At a time when the Trump administration is marketing its so-called “Golden Dome,” a proposed “impenetrable” missile shield around the US, the energy created by A House of Dynamite could be directed to a plan that not only won’t work but will make the problem worse.

Excellent piece on Trump's call to resume nuclear testing in The Independent (and not just because is cites me & my @ucs.org colleague @dkspaulding.bsky.social). BLUF for Trump, as duly noted by our @nuclearban.bsky.social colleague: Melissa Park: "This is no way to win the Nobel Peace Prize."

Yesterday Trump posted a baffling message on his Truth Social site, claiming the U.S. would “immediately” resume the testing of nuclear weapons. No one knew what he meant or why he was saying it. My analysis of Trump’s nuclear confusion now up @MSNBC Daily. www.msnbc.com/opinion/msnb...

My @ucs.org colleague @gkucs.bsky.social has this deeply insightful piece on who would benefit most from a return to full-scale nuclear weapons testing, as Trump _seems_ to have said he has ordered. Bottom-line: China has the most to gain from new nuclear tests.

The Union of Concerned Scientists (@ucs.org) is leading the charge to "Call out the Harm! Sound The Alarm!" regarding the Trump administration's relentless and harmful attack on scientific research & knowledge. Here is a starter pack of scientists sounding that alarm. go.bsky.app/RMo1iWM

UCS staff had the opportunity to see A House of Dynamite in theaters and attend a talk-back with director Kathryn Bigelow and writer Noah Oppenheim. Hear their reactions and learn more about the real-life implications of the film: 🔗 act.ucsusa.org/3JzHFJQ

My @ucs.org colleague @lauraegrego.bsky.social explains how #AHouseofDynamite has the better take on the flawed US anti-missile system than the Pentagon's inaccurate claims that it works. Bottom line: the system has not been shown to work under realistic conditions.

Earlier this year, Nevada passed a (bipartisan!) resolution, AJR 13, opposing the resumption of nuclear testing. Nuclear testing comes with potential harms to people and the environment and NV doesn't want it. Here's what I told the state legislature about why any return to testing is a bad idea:

Murmurs from this admin about nuclear testing are not new, which is why earlier this year, we published this piece in the @thebulletin.org on why a rapid test as a show of force is a BAD, BAD idea.

Actually soon to be available for free for a limited time. Check back soon!

Trump told the Pentagon to "start testing our Nuclear Weapons." He could either mean 1) full-scale, underground testing of nuclear bombs, something no country is doing, or 2) testing nuclear delivery vehicles, which Russia just did a LOT of, or 3) both. If #1 or #3, check these @ucs.org pubs out:

I’ll give someone $1000 if they can find one factually correct statement in this post

A good thread on Russia’s potential reaction should the US resume explosive testing of nuclear weapons, i.e., blowing up a nuclear bomb. As I said elsewhere, Trump may well mean testing US missiles i.e., the delivery vehicles for bombs

Great thread by my @ucs.org colleague

The president has ordered the “Department of War” to immediately resume nuclear testing. Here’s a thread on what you need to know (1/n)

I'd argue that many if not most folks are NNSA are quite happy to not be testing nuclear weapons. Indeed, in his confirmation hearing, Trump's nominee to head the NNSA, Brandon Williams, declared that he would oppose a resumption of testing. He just took office last month.

Trump recently tweeted he was directing the DoD to start testing our nuclear weapons on an equal basis [with other countries] www.nytimes.com/2025/10/29/u...

Damn it, he's gotten around to nuclear weapons. www.theguardian.com/us-news/2025... So, an "equal basis" of testing nuclear weapons with Russia and China is probably about what we're doing now with some advantages (eg, access to fusion burn)... 1/2

4/n Kingston has great points. Now w/alt text. USA regularly tests land- & submarine- based ballistic missiles that are deployed with nuclear weapons. Department of Energy has EXTREMELY LITTLE spare capacity to, say, add an explosive testing program. gov chaos & shutdown are not helping.

-Putin has been touting tests of Skyfall and Poseidon this week. (The tests were of nuke-powered, nuke delivery systems-not live warhead detonations) -The Dept of War isnt responsible for nuke explosive testing. Thats DoEs job. -The "renovation of existing weapons" continues.

"Because of other countries testing programs" President Trump ordered the Pentagon "to start testing our Nuclear Weapons on an equal basis". Normally, testing nuclear weapons refers to explosive testing of a nuclear weapon, something the US has not done at full scale since 1992.

I am pretty sure this is the first time I have been on an entertainment news show. I talk to the hosts of TMZ tonight about A House of Dynamite and why the Pentagon is so upset with this Netflix film. You can watch it in the DC area at 7:30pm tonight on Fox 5. www.tmz.com/watch/

My @ucs.org colleague Dr. Laura Grego explains why the Pentagon's _claim_ that a A House of Dynamite is wrong about the effectiveness the anti-missile system that supposedly defends the US against long-range nuclear attack is a load of hooey. The system, as the movie says, is a coin-flip at best.

This piece in the @nytimes.com highlights many of the risks and challenges facing plutonium pit production that we analyzed in our recent @ucs.org report: ✨ www.ucs.org/resources/pl... The current plan is unnecessary, expensive, and risky and there are many alternatives that could increase safety

Today marks 100 days until the expiration of the New START Treaty--the last remaining agreement that limits U.S. and Russian strategic nuclear forces. Once it expires, we will be left with no legal barrier to a major buildup of the world's two largest nuclear arsenals. (🧵👇)

A House of Dynamite is the best film in years on nuclear war. You may think the risks are small, but even a small danger, multiplied over a number of years, sums to an unacceptable chance of nuclear annihilation. My thoughts on the film, below, and this short 🧵. newrepublic.com/article/2016...

There it is.

Our @ucs.org Scoville fellow Sean Manning has this important piece on #HouseofDynamite, laying out exactly how throwing billions or trillions of $$$ at missile defense is not how we solve the nuclear threat. We need solutions that reduce that threat instead. inkstickmedia.com/dont-get-the...

SCIENTISTS REACT 🎬 UCS nuclear experts watched the trailer for A #HouseOfDynamite, coming to Netflix this weekend, and here’s what they had to say: “I hope this film is a wake-up call.” Take action: act.ucsusa.org/4hormMp

"Humanity cannot coexist with nuclear weapons forever." - critical takeaway from my @ucs.org colleague Jenn Knox's must-read piece "Five Things to Know Before Watching A House of Dynamite," the @netflix.com movie premiering in theater's tomorrow: blog.ucs.org/jknox/five-t...

Today in 1964, 22 miles from Hattiesburg, Mississippi, the first of two underground nuclear tests was conducted as part of Project Dribble (a joint DOD-AEC effort under the VELA Uniform program) to ascertain whether nuclear explosions in salt domes could be detected and accurately measured.

We're showing up at #NoKings to defend science and democracy. Share your #EvidenceBasedOutrage and help #SaveScienceSaveLives with these free downloadable signs. (Pro tip: For best results, print your sign on heavy paper at your local copy shop!)

Will FEMA be ready for disaster response and recovery in its current hobbled state, especially when many other federal resources will literally be shut down? @ucsshana.bsky.social explores this pressing question in her latest blog.

Join the webinar “Science in a Shifting Political Landscape,” where UCS’s Dr. Kristie Ellickson & @dminovi.bsky.social will discuss findings from our recent report documenting how attacks on science have undermined scientists’ work & how this affects public health. 📍Thursday, 10/23, 10 am PT. RSVP:

Dear Heritage, PLEASE do a BIG push for mobile ICBMs to wander the country. That approach would make the missiles FAR less vulnerable, which has many advantages. Plus, it is never going to happen & every minute you do this you aren't doing something horrific. www.heritage.org/defense/comm...

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EVERYONE should see #AHouseofDynamite!

Every American - indeed everyone around the world - should see #AHouseofDynamite. I saw it last night and was enthralled and terrified and hugely impressed. Go see it now in theaters!

"Humanity cannot coexist with nuclear weapons forever." - critical takeaway from my @ucs.org colleague Jenn Knox's must-read piece "Five Things to Know Before Watching A House of Dynamite," the @netflix.com movie premiering in theater's tomorrow: blog.ucs.org/jknox/five-t...

Tomorrow "A House of Dynamite" will blow up on screens across the US. Fast-paced, action-oriented, true-to-life story telling about the threat that every American, indeed every human, faces every day. My colleague Jenn Know has "Five Things to Know" before you watch: blog.ucs.org/jknox/five-t...

So excited for Sébastien Philippe, who won a MacArthur "genius" award for his work "exposing past harms and potential risks from building, testing, and storing launch-ready nuclear weapons." He is a truly deserving recipient! www.macfound.org/fellows/clas...

The data and evidence are clear. Over the past 8 months, the egregious actions of President Trump and his enablers have caused real harm to people and communities across the country.

We @ucs.org proudly host a Scoville fellow now and are so lucky to have them on our team! We encourage anyone interested in working in the field of international peace and security to apply! It is a great opportunity for the fellows and real benefit to UCS.

My colleague @dkspaulding.bsky.social with a deeply moving essay about his time on the "Golden Rule," a sailing ship that decades ago sought to halt nuclear testing and today, run by @veteransforpeace.bsky.social, continues to oppose nuclear weapons and war: blog.ucs.org/dylan-spauld...

In an era defined by climate disruption, widening inequality, and political volatility, the role of scientific data in informing public health and environmental policy has never been more critical. UCS’s Melissa Finucane explores the challenges of protecting it in uncertain times.