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. A new US phone network for Christians aims to block porn and gender-related content A new US-wide cell phone network marketed to Christians is set to la unch next week. It blocks porn using network-level controls that can’t be turned off—even by adult account owners. It’s also rolling out a filter on sexual content aimed at blocking material related to gender and trans issues, optional but turned on by default across all plans. The trouble is, many websites don’t fit neatly into one category. That leaves its maverick founder with broad, subjective control over what is allowed or banned. Read the full story. —James O’Donnell This startup’s new mechanistic interpretability tool lets you debug LLMs The San Francisco–based startup Goodfire has released a new tool, Silico, that lets researchers peer inside an AI model and adjust its parameters during training. It could give users more control over how this technology is built than was once thought possible. The goal is to make building AI models less like alchemy and more like a science. Using a technique called mechanistic interpretability, Silico maps the neurons and pathways inside a model and lets developers tweak them to reduce unwanted behaviors or steer outputs. By exposing the “knobs and dials,” Goodfire hopes to bring AI training closer to traditional software engineering. Read the full story. —Will Douglas Heaven With mass firing, Trump deals a fresh blow to American science This past week delivered another gut punch for science in the US. This time, the target was the National Science Foundation—a federal agency that funds major research projects to the tune of around $9 billion. On Friday, the 22 scientists overseeing those efforts were all fired. Since 2025, the NSF has faced budget cuts, grant terminations, and mass firings, with staff numbers down sharply and many ambitious projects grinding to a halt. The result is a major shift in how American science is funded and governed. Discover what it means, and what’s next. —Jessica Hamzelou This article first appeared in The Checkup, MIT Technology Review’s weekly biotech newsletter. To receive it in your inbox every Thursday, and read articles like this first, sign up here. China’s open-source bet: 10 Things That Matter in AI Right Now Silicon Valley AI companies follow a familiar playbook: keep the models behind an API and charge for access. China’s leading AI labs are playing a different game, releasing “open-weight” models that developers can download, adapt, and run on their own hardware. That approach went mainstream after DeepSeek open-sourced its R1 model, which matched top US systems at a fraction of the cost. It also won something subtler: goodwill with developers. A growing cohort of Chinese labs is now following the same blueprint. As AI shifts from hype to deployment, open-source models are making the future of AI more multipolar than Silicon Valley expected. Read the full story. —Caiwei Chen China’s open-source bet is one of the 10 Things That Matter in AI Right Now, our list of the biggest ideas, trends, and advances in AI today. We’re unpacking one item from the list each day here in The Download, so stay tuned. The must-reads I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology. 1 Elon Musk has admitted that xAI trained Grok on OpenAI models“Distillation” is standard practice in AI, despite being legally dubious. (Wired $)+ The White House has accused Chinese firms using distillation of theft. (BBC)+ American labs are widely assumed to use similar techniques. (TechCrunch) 2 A “de-extinction” startup wants to resurrect a long-lost antelopeColossal Biosciences wants to bring back the bluebuck. (Axios)+ The company is using genomic editing to revive the animal. (Gizmodo)+ It previously claimed to have cloned red wolves. (MIT Technology Review) 3 ​​An OpenAI model outperformed ER doctors at diagnosing patientsBy analyzing health records data and information provided to physicians. (NPR)+ But it still must be proven in real-world clinical trials. (Vox) 4 Scientists are trying to power AI data centers with tiny nuclear reactorsThey could provide a new way to meet AI’s energy demands. (Gizmodo)+ We did the math on AI’s energy footprint. (MIT Technology Review) 5 Spotify has started verifying human artistsA new badge will distinguish them from AI. (The Guardian)+ Spotify has faced criticism for its handling of AI. (BBC) 6 The US is backing a Congolese railway to break China’s grip on critical mineralsThe old railroad is key to the race for critical metals in Africa. (Rest of World)+ The US is also searching for alternative sources. (MIT Technology Review) 7 Huawei is set to overtake Nvidia in China’s AI chip marketIt’s expected to capture the largest market share this year. (FT $) 8 Japan is building cardboard drones for the battlefieldThe flatpack designs are cheap, disposable, and built at scale. (404 Media) 9 The more young people use AI, the more they hate itResearch shows that Gen Z doesn’t trust GenAI. (The Verge) 10 A new organoid can menstruate—and show how tissue repairs itselfIt’s revealing how the uterus can shed without scarring. (Nature) Quote of the day “I suspect that there are a number of people who do not want to put the future of humanity in Mr Musk’s hands. But we’re not going to get into that.” —Judge Gonzalez Rogers rebukes attempts by Elon Musk’s lawyer to focus on AI’s existential risks as part of his lawsuit against OpenAI, the New York Times reports.  One More Thing TMY350 VIA WIKIMEDIA COMMONS This rare earth metal shows us the future of our planet’s resources The materials we need to power our world are shifting from fossil fuels to energy sources that don’t produce greenhouse gas emissions. Take neodymium, a rare earth metal used in powerful magnets that power everything from smartphones to wind turbines. Its story reveals many of the challenges we’ll likely face across the supply chain in the coming century and beyond. The question isn’t whether we’ll run out, but how we extract, process, use, and recycle these materials as technology keeps changing. Find out what it reveals about the future of our planet’s resources. —Casey Crownhart 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.)+ Here’s a fascinating visual history of exploring the dark side of the Moon.+ This interactive map lets you compare the actual dimensions of our world.+ These five tiny homes are proof you don’t need a massive footprint to live with style.+ Explore the history of “Control Room Green” and why it was the default choice for the Cold War’s highest-stakes environments.Top image credit: Stephanie Arnett/MIT Technology Review | Adobe Stock ...read more read less