Four U.S. Nuclear Reactors Reach Key Milestone on Independence Day
On America’s 250th birthday, four nuclear microreactors achieved criticality—a technical milestone meaning they can sustain a chain reaction. This surpasses the goal set by the previous administration, which called for three reactors to reach this stage by July 4. The achievement comes at a time when demand for clean, emissions-free electricity is rising. However, reaching criticality does not mean these reactors are ready to supply power to the grid. The milestone signals progress for nuclear technology, but each company still faces significant steps before commercial operation, reports MIT Technology Review AI.
In other tech news, China is reportedly preparing to allow its leading AI firms—including Alibaba, ByteDance, and DeepSeek—to purchase Nvidia’s H200 chips. The U.S. had previously authorized these sales, but Beijing withheld approval. The move could boost China’s AI capabilities amid ongoing tensions over semiconductor exports. Meanwhile, NATO is building a detection network using sensors, drones, satellites, and AI to counter Russian cyberattacks. Researchers are also exploring controversial geoengineering methods, such as dimming sunlight, to mitigate future El Niño events, though experts warn of unintended consequences.
Meta is patenting an AI device that records users to analyze emotions, ostensibly for personalized workout plans, raising privacy concerns. Chipmakers are stacking transistors vertically to keep advancing as Moore’s Law slows. A study found that Ivy League students suspected of AI cheating saw their in-person test scores drop from 96% to 48%. Parents’ phone addictions are linked to weakened bonds with children, potentially causing lifelong insecure attachment. A judge approved Elon Musk’s $1.5 million Twitter settlement with the SEC despite citing “serious misgivings.” Finally, shoebox-sized satellites could detect nuclear bombs in space, and a World Cup match drove Google Search traffic to a new record.