The Fabric of Reality: The Science of Parallel Universes--And Its ImplicationsA penetrating exploration of the new physics, including time travel, quantum computers, and the multiverse as referenced in the film "Avengers: Endgame" For David Deutsch, a young physicist of unusual originality, quantum theory contains our most fundamental knowledge of the physical world. Taken literally, it implies that there are many universes "parallel" to the one we see around us. This multiplicity of universes, according to Deutsch, turns out