Fascinating book - quite heavy going though; I had to put my thinking cap on for some of it. The first chapter sticks in my mind as having one of the most elegant analogies for dimensions and how they might affect you even though you don't see them. Of course, that's what popular science books are for; to explain how things work to you - or could work, in this case. It's all about hyperspace and time travel and whether or not it's possible. It was on my wish list and I was given two copies so I thought I'd set one free. I hope you enjoy it!