Bret Taylor, the chairman of OpenAI’s board, said the artificial intelligence company was “not for sale.” Mr. Musk is separately raising money for his A.I. start-up, xAI. By Cade MetzMike ...

The new administration has upended that expectation. The 88-year-old pontiff, who has been battling health problems for years, has begun treatment in a Rome hospital. Ukraine said that a Russian ...