This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. Inside the quest to combat Arctic fires and save the planet’s frozen carbon —James Temple In July 2021, a wildfire burned through a forest on the University of Alaska, Fairbanks campus, stripping away the moss and organic-rich soil insulating the permafrost below. Five years later, I followed researchers into the forest to investigate how fighting fires could help keep that carbon locked in the ground. A simple metal probe revealed how much deeper the ground had thawed. This rudimentary tool offered a glimpse of an escalating problem: As climate change fuels more frequent and severe fires, they’re accelerating permafrost thaw and releasing greenhouse gases. Now, researchers are exploring how to break that cycle. But how much should we spend, and what risks are worth taking? Read the full story on how scientists are rethinking the fight against wildfires. AI researchers stranded Claude on a virtual desert island. It started to “play.” What do AI agents do if you don’t tell them to do anything? The answer looks a lot like play. Researchers repeatedly stranded them alone on a virtual desert island for 30 hours in an experimentreminiscent of the movies Cast Away or Home Alone. The agents started behaving in surprising ways. They set about exploring the limits of the world, and came up with their own goals—attempting to scale the highest point on the map, or seeing how high they could throw a block. A lot of what they were doing met the bar for play. But is it truly playful behavior, or simply role-playing? Read our full story to learn more. —Amit Katwala 10 Climate Tech Companies to Watch: X-energy and its helium-cooled nuclear reactors X-energy is one of MIT Technology Review’s 10 Climate Tech Companies to Watch 2026, available exclusively to subscribers. Making concrete, steel, and chemicals takes huge amounts of heat, much of it generated by burning fossil fuels. X-energy hopes to offer an alternative with a nuclear reactor that uses helium gas instead of water as a coolant, allowing it to operate at higher temperatures. The proposed Xe-100 reactor could supply superheated steam directly to industrial facilities, generate 80 megawatts of electricity—or do both. See how X-energy hopes to bring high-temperature nuclear power to heavy industry. —Mark Ellis Harris Subscribers can now access the full 10 Climate Tech Companies to Watch, spanning everything from cleaner cement to streamlined geothermal power. Catch up on our conversation with a creator of AI-designed viruses Can AI design new life forms? In 2025, Stanford University PhD student Samuel King came up with a preliminary answer when he used a generative AI model to propose genetic blueprints for microscopic viruses. It isn’t yet an example of AI-generated life, but that could be next. He spoke about his work with our senior AI reporter James O’Donnell on Friday. If you missed it, you can watch their chat now, and subscribe to get invites to our Roundtables events in future. The must-reads I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology. 1 Tech stocks shed over $1 trillion on Friday It’s unclear if AI companies can turn sustainable profits, and investors are getting jittery. (NBC) + Musk and Anthropic are pledging big financial giveaways. (BBC) + Microsoft just pulled out of a giant AI cloud deal in the UK. (Gizmodo) + What’s at stake in AI’s trillion-dollar gamble. (MIT Technology Review) 2 Do we really want AI agents smoothing out all friction in our lives? They promise convenience, but right now they’re mostly introducing chaos. (The Atlantic $) + Here’s what it’s like to outsource your life to them. (Vox $) + Websites are starting to close their doors to AI agents. (The Verge $) + AI agents bring new headaches for online sellers. (WSJ $) 3 How drones have transformed the front line in Ukraine They’ve effectively created a “kill zone”, and it’s growing wider and deadlier. (NYT $) + Trump has denied ordering Starlink restrictions in Ukraine. (CNBC) 4 China is considering restricting overseas access to its AI models It’s also looking at curbing the sharing of chip designs, among other measures. (Bloomberg $) + Why western open weight models still can’t compete with Chinese ones. (Rest of World) + Why Trumpworld still can’t agree on how to respond to Chinese AI. (MIT Technology Review) 5 HTC’s smart glasses are way more private than Meta’s Guess that’s a benefit of not being shackled to a massive social media platform. (Wired $) + A bug caused Meta’s glasses to record conversations without the wearer knowing. (Ars Technica) + Smart glasses are already causing havoc in India. (MIT Technology Review) 6 Inside one man’s quest to build California’s biggest AI data center Sebastian Rucci didn’t bank on meeting huge resistance from local residents. (The Guardian) + Americans are packing town halls to stop data centers, and it’s working. (Quartz $) + No wonder companies are exploring putting them in space. (MIT Technology Review) 7 Somebody vibe-coded a gun for the first time And it seems like it works (sometimes.) (The Verge $) 8 AI might reshape how we grieve It’s never been easier to create realistic AI chatbots of people who’ve passed. (Vox $) + Deepfakes of your dead loved ones are a booming business in China. (MIT Technology Review) 9 Japan is about to launch a mission to Mars’ largest moon If all goes well, it should help us to understand how it formed. (New Scientist $) 10 Amateurs are cracking long-secret codes and ciphers One of the more fun uses for large language models! (Nature) Quote of the day “Google wouldn’t have taken my call in the first term. Now they kiss my ass.” —President Trump brags about how much Big Tech bends the knee to him during a rally in Kentucky this weekend, the Verge reports. One More Thing SIMON MITCHELL There are more AI health tools than ever—but how well do they work? In the last few months alone, Microsoft, Amazon, and OpenAI have all launched medical chatbots. There’s a clear demand for these tools, given how hard it is for many people to access advice through the existing medical system—and they could make safe, useful recommendations. But concerns have surfaced about how little external evaluation they undergo before being released to the public. Read the full story to understand what’s at stake. —Grace Huckins We can still have nice things A place for comfort, fun and distraction to brighten up your day. (Got any ideas? Drop me a line.) + Japan is showing what happens when technology and design are put in service of people. + What happens when you put marbles on a grand piano’s strings? Vinheteiro has the answer. + Poop from Southern right whales suggests they may be more resilient to climate change than we thought. + Perfectly Imperfect, the world’s first “social magazine,” offers recommendations for music, films, books, and more from people—not algorithms.