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Plus: The Pentagon says it used Grok in strikes on Iran. For decades, physicists have hunted for weakly interacting massive particles (WIMPs), a leading candidate for dark matter. But their search has run into a new problem: neutrinos. These tiny particles from the sun and other stars can create a "neutrino fog" that drowns out any signal of dark matter. Hitting the neutrino fog does not, however, mean an end to the search. Researchers just have to shift the focus of their hunt.

Anthropic has suspended its powerful new AI model after US authorities raised security concerns just days following its public release. In a statement published on its website, Anthropic said it was ordered to suspend foreign nationals from using Claude Fable 5, a program that the company self-described as too powerful. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance, the company wrote. Anthropic and the Trump administration are involved in a separate ongoing lawsuit over an order to stop government agencies using the company's AI tools. The BBC has approached the US Department of Commerce for comment.

Why Real-Life Disclosure Day Will Look Nothing Like Steven Spielberg's New Movie Previous landmark scientific discoveries like the Higgs boson provide a better template for what it will take to confirm whether aliens have made contact with Earth. Steven Spielberg's new film imagines the moment 8 billion humans find out that we are not alone in the universe. The movie, which opens in US theaters on June 12, is a fictional account of the government cover-up and subsequent "disclosure" of evidence that aliens have contacted Earth. The UFO community has been chasing that type of cinematic big reveal for 80 years. But it's more likely that monumental scientific discoveries, like the detection of the Higgs boson in 2012 and the confirmation of gravitational waves in 2016, are a better guideline for how real-world disclosure is likely to play out: through long-running research and with verifiable results.

The US military has long known that cheap fixes could stop location data from exposing its troops. It adopted almost none--and now says adversaries are using the data to target soldiers during a war. For nearly a decade, the Pentagon was warned--by its own contractors, analysts, and intelligence agencies--that anyone with a credit card could buy a map of where American troops sleep, work, and store nuclear weapons. Now the bill has come due in a war zone. A newly disclosed letter shows the warnings went unheeded: US Central Command now confirms it has received "multiple threat reports concerning adversary exploitation of commercial location data to target or surveil US personnel in theater"--the first official acknowledgment that the data-broker economy is being used to hunt American forces in the Middle East.

Plus: NASA unveiled plans for three uncrewed missions to the Moon this year. Here at we understand exactly how relentless the pace of news from the world of artificial intelligence feels New models and capabilities crop up as fast as we can cover them, and the ripple effects they send through tech and wider society are never far behind. Our unique strength lies in cutting through the day-to-day noise to help you understand what's really happening, and what lies around the corner. That's why we created our list of 10 Things That Matter in AI Right Now, unveiled at our flagship AI event EmTech AI a few weeks back ( check the list out if you haven't already!) And it's why we publish so many stories dedicated to explaining how AI works, and what's coming next . We also regularly run live subscriber-only Roundtables events--you can still catch up on last week's session, where we explored how AI might enter the physical realm via world models.

The Defense Department has released a new trove of declassified documents about government UFO sightings. The Pentagon released a batch of much-anticipated files about unidentified anomalous phenomena (UAP) on Friday, including newly declassified documents that have never been seen by the public before. The release of roughly 160 documents was rolled out on a new website . Among the trove is video footage and images of tantalizing UAP sightings captured around the world. The files also contain scanned historical material about government UAP and unidentified flying object (UFO) programs dating back to the 1940s and the Apollo program.

Pentagon says US military to be an'AI-first' fighting force The US military plans to increase its use of artificial intelligence (AI) further after the Pentagon agreed to new and expanded contracts with some of the biggest names in technology. Under eight agreements with Google, OpenAI, Amazon, Microsoft, SpaceX, Oracle, Nvidia and the start-up Reflection, the Pentagon said AI technology would now be used for any lawful operational use. These agreements accelerate the transformation [of] the US military as an AI-first fighting force, the Pentagon said. Conspicuous by its absence is Anthropic, as the company has said it is concerned about how the Pentagon could use its tools in warfare and domestically. The firm is now suing the government over the alleged retaliation it faced after refusing to accept any lawful use language in its own contract.

Five former US officials, including a former top military lawyer, have criticised the Pentagon for not acknowledging potential American involvement in a deadly strike on an Iranian school earlier this year. Some of those officials said it was highly unusual not to release even basic details of the strike after such a length of time. A missile hit a primary school in Minab during the opening salvos of the US-Israeli war on February 28, killing 168 people including around 110 children according to Iranian officials. In the two months since then the Pentagon has said only that the incident is under investigation. US media reported in early March that US military investigators believed American forces were likely responsible for hitting the school unintentionally but had not reached a final conclusion.

In its early days, the AI initiative known as Project Maven had its fair share of skeptics at the Pentagon. Today, many of them are true believers. The rise of AI warfare speaks to the biggest moral and practical question there is: Who--or what--gets to decide to take a human life? And who bears that cost? In 2018, more than 3,000 Google workers protested the company's involvement in "the business of war" after finding out the company was part of Project Maven, then a nascent Pentagon effort to use computer vision to rifle through copious video footage taken in America's overseas drone wars. They feared Project Maven's AI could one day be used for lethal targeting. In my yearslong effort to uncover the full story of Project Maven for my book,, I learned that is exactly what happened, and that the undertaking was just as controversial inside the Pentagon. Today, the tool known as Maven Smart System is being used in US operations against Iran . How the US military's top brass moved from skepticism about the use of AI in war to true believers has a lot to do with a Marine colonel named Drew Cukor. In early September 2024, during the cocktail hour at a private retreat for tech investors and defense leaders, Vice Admiral Frank "Trey" Whitworth found his way to Drew Cukor. Now Project Maven's founding leader and his skeptical successor were standing face-to-face. Three years earlier, Whitworth had been the Pentagon's top military official for intelligence, advising the chairman of the Joint Chiefs of Staff and running one of the most sensitive and potentially lethal parts of any military process: targeting.