The money in Elon Musk's business empire is increasingly converging in one direction: artificial intelligence (AI). The billionaire said on Sunday that he plans to let Tesla shareholders vote on whether to allow the company to invest in xAI, an artificial intelligence venture founded two years ago. SpaceX, Musk's space transportation company, recently agreed to invest about $2 billion in xAI, according to people familiar with the matter. Musk said he does not support putting...