Four US Nuclear Reactors Achieve Criticality Milestone

Four US nuclear reactors achieved criticality, a significant technical milestone, just in time for the nation's 250th birthday. This achievement means these reactors can now sustain a chain reaction, a crucial step towards potentially providing electricity. The Trump administration had set a goal for three new microreactors to reach criticality by this deadline, and four have now met this objective. This development is seen as a positive indicator for nuclear technologies, especially amid growing demand for electricity and the need for emissions-free energy sources.

While achieving criticality is a major step, it does not mean the reactors are immediately ready to supply power to the grid. The milestone signifies progress in the development of nuclear power in the United States. The four companies involved may now proceed to further stages of reactor development and testing. This news comes from The Spark, a climate tech newsletter, highlighting the ongoing importance of clean energy solutions.

In other technology news, China is reportedly planning to allow its leading artificial intelligence firms, including Alibaba, ByteDance, and DeepSeek, to purchase Nvidia H200 chips. This move follows previous withholding of approval despite US authorization for these sales. This development could impact the global AI chip market and China's advancements in AI research and development.

Additionally, NATO is developing a network designed to counter Russian attacks by utilizing sensors, drones, satellites, and artificial intelligence to detect threats. This initiative aims to enhance the alliance's defense capabilities. Meanwhile, researchers are exploring new strategies to combat future El Niño events, including the concept of dimming the sun to cool the oceans and mitigate associated risks, though potential unintended consequences are also being considered.