text: how can you tell if you are living in a parallel universe?   you are, always a different one.  every time a decision is made somewhere, the universe divides into the number of possible outcomes. since the universe is infinite, then an infinite number of decisions are made, and therefore there are infinite numbers of alternate universes forming every second. our consciousness as we experience it follows its own course determined by the decisions we make. thus, we are always and will always be unaware of passage through these universes.  also, think of it this way:  in an alternate universe hitler won world war ii. do you think you exist there? how different do you think you are? our present "universe" and that one have diverged, probably far.