Hi, I was watching a Royal Institution lecture on this experiment. Using light, it's not quantum physics, it's waves; when the lecturer considered using particles, like individual atoms, and no detector, you get bands like an interference pattern. Is this something that has actually been done or is it some sort of thought experiment? Brian Cox showed something similar, concerning elections, but I couldn't make out if that is something that had been done in fact. The pint about no detector was baffling too. If someone could she'd some light please. Thank you for your time. Regards, b1ll.