This is what happens when you start to think, just for a moment, about the real-world implications of time travel. It's not just physics, it's intelligent philosophy, theology and a bucketload of off-beat humour all mixed up in a delicious cake. The purpose of this book is to answer the question: "OK, how do I do it? I want to see a dinosaur. I don't have a space-ship and there are no wormholes in my back garden - what do I do?". Possible Answer 1: Borrow Richard Branson's Rocket ship and zoom off before he notices... Possible Answer 2: Work out what reality is first, then work out how you worked that out. Best Answer: Read the book! The science and physics is presented in a light hearted and easy way, the philosophy is deeply thought provoking and the theology... well, as Einstein said. "Science without religion is lame".