Science fiction has a long tradition of exploring the idea of alternative worlds, especially in relation to the many-worlds interpretation of quantum mechanics, which suggests that any universe that can exist actually exists somewhere. If we could shuffle our probable lives like a deck of cards, we would see how loved ones become strangers, and strangers become loved ones; how some children disappear and others take their place. It would become obvious what endless changes houses, apartments, cars, and pets undergo. And it would no longer be possible to hide the transformation of respectable people into villains, villains into heroes...