Paul Davies examines the consequences of Einstein's relativety theory, some 100 years after it was first put forward. Important though Einstein's theory turned out to be, it does not solve "the riddle of time". The search to find a unified field theory, or "Theory of Everything", remains at the top of the scientific agenda. When scientists began to explore the implications of Einstein's time for the universe as a whole, they made the discovery that time, and hence all of physical reality, must have a definite origin in the past. The origin of time is known today as the big bang. In this book, Davies recounts the struggles with the mysteries of time, black holes, time warps, time travel, the existence of God, the nature of the universe and the place of humans in the cosmos.