The popularity of commercial nuclear reactors has surged in recent years as worries about climate change and energy independence drowned out concerns about meltdowns and radioactive waste. The problem is, building nuclear power plants is expensive and slow. A new generation of nuclear power technology could reinvent what a reactor looks like--and how it works. Advocates hope that new tech can refresh the industry and help replace fossil fuels without emitting greenhouse gases. Here's what that might look like . Next-gen nuclear is one of our 10 Breakthrough Technologies this year.

Plus: California's AI safety bill has passed into law Wrinkles and gray hairs aside, it can be difficult to know how well--or poorly--someone's body is truly aging. A person who develops age-related diseases earlier in life, or has other biological changes associated with aging, might be considered "biologically older" than a similar-age person who doesn't have those changes. Some 80-year-olds will be weak and frail, while others are fit and active. Over the past decade, scientists have been uncovering new methods of looking at the hidden ways our bodies are aging. And what they've found is changing our understanding of aging itself. Can we repair the internet?

The world is full of extraordinary young people brimming with ideas for how to crack tough problems. Every year, we recognize 35 such individuals from around the world--all of whom are under the age of 35. These scientists, inventors, and entrepreneurs are working to help mitigate climate change, accelerate scientific progress, and alleviate human suffering from disease. Some are launching companies while others are hard at work in academic labs. They were selected from hundreds of nominees by expert judges and our newsroom staff. Get to know them all--including our 2025 Innovator of the Year-- in these profiles .

If you woke up to a Windows PC suddenly without Microsoft's Copilot app installed, you didn't dream the last few years of AI hype, Microsoft just made a mistake. The latest monthly Windows 11 update that rolled out on March 11 "unintentionally uninstalled and unpinned" the AI assistant, according to a Microsoft support article spotted by The Verge. Microsoft is aware that Copilot's gone missing and is "working on a resolution to address this issue." For now, if you want Copilot back, you can redownload its app from the Microsoft Store and manually pin it to your taskbar. Just like any new feature, since Copilot was added to Windows in 2023, there's been people interested in removing it.

As of March 28, Amazon Echo models that were previously able to process Alexa requests locally will no longer do so, instead sending those voice recordings to the cloud. An Amazon spokesperson confirmed the change to The Verge after a Reddit user posted a PSA about it on Friday, with a screenshot of an email they'd received from the company. The change applies to the Echo Dot (4th Gen), Echo Show 10 and Echo Show 15, according to The Verge. Per the email shared on Reddit, the settings for Echo users who enabled the'Do Not Send Voice Recordings' option will automatically change to'Don't save recordings.' It goes on to say, "This means that, starting on March 28th, your voice recordings will be sent to and processed in the cloud, and they will be deleted after Alexa processes your requests. Any previously saved voice recordings will also be deleted."

For every technological gadget that becomes a household name, there are dozens that never catch on. This year marks a full decade since Google confirmed it was stopping production of Google Glass, and for a long time it appeared as though mixed-reality products would remain the preserve of enthusiasts rather than casual consumers. Fast-forward 10 years, and smart glasses are on the verge of becoming--whisper it--cool. Sleeker designs are certainly making this new generation of glasses more appealing. But more importantly, smart glasses are finally on the verge of becoming useful, and it's clear that Big Tech is betting that augmented specs will be the next big consumer device category.

Meta sent a letter to California's attorney general on Thursday urging him to stop OpenAI from converting to a for-profit company, a move that Meta says would be "wrong" and "could lead to a proliferation of similar start-up ventures that are notionally charitable until they are potentially profitable." The letter from Meta Platforms to Attorney General Rob Bonta, first reported on by The Wall Street Journal, comes on the heels of an injunction filed by Elon Musk at the end of November that also asked for OpenAI's conversion to be blocked. Meta argues in its letter, which The Verge has published in full, that OpenAI was able to raise billions of dollars from investors under its original nonprofit mission and now "wants to change its status while retaining all of the benefits that enabled it to reach the point it has today." It goes on to say, "OpenAI should not be allowed to flout the law by taking and reappropriating assets it built as a charity and using them for potentially enormous private gains." The letter also calls upon the attorney general to look into OpenAI's past practices as a nonprofit.

OpenAI will start announcing new features and demos tomorrow for 12 days through livestreams. Sources familiar with the matter told The Verge that these new products will allegedly include OpenAI's long-awaited text-to-video tool, Sora, and a new reasoning model. The announcement for "12 Days of OpenAI", as the company puts it, was made public on X yesterday. The first livestream will broadcast tomorrow, but the announcements themselves remain unconfirmed That said, in addition to the sources that spoke more recently with The Verge, the Wall Street Journal previously reported Sora was likely to come out before the end of 2024. Sora was revealed early this year, and shared with a small group of testers. But 20 or so of those artists leaked the model to the public in protest of "unpaid labor," The Washington Post reported.

Bluesky, which has surged in the days following the US election, said on Friday that it won't train on its users' posts for generative AI. The declaration stands in stark contrast to the AI training policies of X (Twitter) and Meta's Threads. Probably not coincidentally, Bluesky's announcement came the same day X's new terms of service, allowing third-party partners to train on user posts, went into effect. "A number of artists and creators have made their home on Bluesky, and we hear their concerns with other platforms training on their data," Bluesky posted (via The Verge) on Friday. "We do not use any of your content to train generative AI, and have no intention of doing so."

After weeks of speculation about a new and more powerful AI product in the works, OpenAI today announced its first "reasoning model." The program, known as o1, may in many respects be OpenAI's most powerful AI offering yet, with problem-solving capacities that resemble those of a human mind more than any software before. Or, at least, that's how the company is selling it. As with most OpenAI research and product announcements, o1 is, for now, somewhat of a tease. The start-up claims that the model is far better at complex tasks but released very few details about the model's training.