Scientists are studying the effects of extreme heat on the brain, which can lead to increased irritability and violence, while the Trump administration has asked OpenAI to limit its next model release, citing the need to vet initial users, in a move that marks the first time a US firm has been told to restrict an AI model before release. This development highlights the growing intersection of technology and policy, and why it matters is that it sets a significant precedent for the regulation of AI in the US and beyond.