It seems physicists have come to the conclusion that a single electron travels through both slits at the same time, otherwise there wouldn't be an interference pattern when only one electron is being sent through the apparatus. Apparently this experiment has been done in real life. You can't send only a single electron though the apparatus at a time, can you? You have to send a bunch of them at a time, I would think. If so, how do we know that the interference wasn't caused by two or more electrons entering the slits and causing the interference pattern?