According to Michio Kaku, our universe is one of many. The best way to make sense of quantum mechanics and the ability of subatomic particles to exist in several different states at the same time is to postulate the existence of a multiverse. These different universes may be connected to each other via wormholes in spacetime, but even if they are not, string theory  - the theory that supports their existence -  can make predictions that we can test right here, in our own universe. It’s the most mathematically elegant and symmetrical theory we have to date, and, according to Michio Kaku, what our past succesful theories tell us is that symmetry is a good guide to reality. Read the full interview below.

How did the idea of the multiverse come about?