The UN headquarters in Manhattan. Credit: Spencer Platt/Getty ImagesA roll call of weighty names — including 10 Nobel Prize winners and two former heads of state — have called for international action to put in place “red lines” for AI development by the end of 2026.The more than 200 signatories, who also include senior employees at OpenAI, Google DeepMind and Anthropic, cite the dangers of engineered pandemics and mass unemployment, and note that many experts “warn that it will become increasin...