The mathematics underlying quantum mechanics—or at least, one perspective on the math—suggests that all possible outcomes happen, each inhabiting its own separate universe. If a quantum calculation predicts that a particle might be here, or it might be there, then in one universe it is here, and in another it is there.
But why is this the mathematically necessary answer? It seems to be rather a philosophical adaption that results in a preferred conclusion. Just because the math showed all things are possible, why does it follow that all things must be actual?
