Brian Greene's The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos explores our most current scientific understanding of the universe, the 'string theory' that might hold the key to unifying nature's laws, and our continuing quest to know more. There was a time when 'universe' meant all there is. Everything. Yet, as physicist Brian Greene's extraordinary book shows, ours may be just one universe among many, like endless reflections in a mirror. He takes us on a captivating exploration of parallel worlds - from a multiverse where an infinite number of your doppelgangers are reading this sentence, to vast oceans of bubble universes and even multiverses made of mathematics - showing just how much of reality's true nature may be hidden within them.