There was a time when "universe" meant all there is. Everything. Yet, as 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.