The Delay Choice Experiment

Local realism is false. It's been tested many, many times. All sorts of loopholes have been proposed and closed. And every time we close a loophole, we still get the same effect. John Wheeler came up with a thought experiment which made this weird thing slightly weirder. But at least in theory, if we were looking at some very, very distant object, like a galaxy that's 10 billion light years away, they will presumably behave in the same manner.