> At least not to the satisfaction of most practising physicists. This is true, as the parent said - it's not accepted by many physicists. > However, it requi

> At least not to the satisfaction of most practising physicists. This is true, as the parent said - it's not accepted by many physicists. > However, it requires you to make a pretty arbitrary division between the observed system and the wider environment. This isn't true. The whole universe is in a superposition and you can reason with decoherence at any level. Literally everything in one "world" including the vacuum of space is entangled with everything else, though to a very small degree.