"A rich and rewarding history of one of the most astounding ideas in physics and astronomy" (Marcia Bartusiak) - that the universe we know isn't the only one Our books, our movies--our imaginations--are obsessed with extra dimensions, alternate timelines, and the sense that all we see might not be all there is. In short, we can't stop thinking about the multiverse. As it turns out, physicists are similarly captivated. ...