Artificial intelligence may come for our jobs one day, but before that happens, the data centers it relies on are going to need a lot of electricity. So how do we power them and millions of U.S. homes and businesses without generating more climate-warming gases? Microsoft founder, billionaire philanthropist and investor Bill Gates is betting that nuclear power is key to meeting that need — and he’s digging into his own pockets to try and make it happen. Gates has invested $1 billion...