I just had one of those lightbulb thoughts a few minutes ago reading someones post. Does observing some particle in an superposed state entangle you with that particle? It makes perfect sense to me right now.. Its definately like entanglement, even if it isnt. Observing the first observers reaction instantly gives you the state of the particle (and vise versa). Wouldnt this mean superposition is relative depending on whos observing? For example if someone did a quantum coin flip to determine whether to spread a deadly virus or not Then everyone on earth would be in a superposition of dead and alive to the rest of the universe, right?