OpenAI’s release of ChatGPT 3.5 set in motion an AI arms race that has changed the world. How that turns out for humanity is something we are still reckoning with and may be for quite some time. In Empire of AI: Dreams and Nightmares in Sam Altman’s OpenAI, Karen Hao tells the story of the company’s rise to power and its far-reaching impact all over the world. —Mat HonanThis startup wants to make more climate-friendly metal in the USThe news: A California-based company called Magrathea just turned on a new electrolyzer that can make magnesium metal from seawater. Why it matters: Today, China dominates production of magnesium, and the most common method generates a lot of the emissions that cause climate change.