fr om Brian Greene, one of the wo r ld’s leading physicists a nd autho r the Pulitzer Prize finalist The Elegant Universe , comes a gra nd tour of the universe that makes us look at reality in a completely different way. Space a nd time fo r m the very fabric of the cosmos. Yet they remain among the most mysterious of concepts. Is space an entity? Why does time have a direction? Could the universe exist without space a nd time? Can we travel to the past? Greene has set himself a daunting task: to explain non-intuitive, mathematical concepts like String Theo r y, the Heisenberg Uncertainty Principle, a nd Inflationary Cosmology with analogies drawn fr om common experience. fr om Newton’s unchanging realm in which space a nd time are absolute, to Einstein’s fluid conception of spacetime, to quantum mechanics’ entangled arena wh ere vastly distant objects can instantaneously coo r dinate their behavio r , Greene takes us all, regardless of our scientific backgrounds, on an irresistible a nd revelato r y journey to the new layers of reality that modern physics has discovered lying just beneath the surface of our everyday wo r ld.