Review: Time Travel in Einsteins Universe. The physical possibilities of travel through time. By J. Richard Gott. John Gribbins book "In search of the edge of time" is one of my all time favourites. So books on tachyonic time travellers, time machines, wormholes in the fabric of space and time, black hole bounces etc. tends to get my attention. And J. Richard Gotts book delivers. Even though there should have been more on the theory of general relativity itself. As well as some additional timemachines. I really got into it right from the start with its brilliant interpretation of special relativity theory. Here special relativity isn't murky waters explained to you by pretentious professors. Instead it is straight forward stuff, and its puzzles are there for all to see. After seeing his presentation of special relativity I don't really understand what all the other presentations was all about, except layers of confusion. General Relativity is almost equally easy in Gotts hands. Ten mathematical objects called tensors that informs you how spacetime is curved based on mass energy density, pressure, etc. With these tools comes various suggestions for constructing a timemachine. Despite the enormity of some of these constructions (dragging your medium star a couple of lightyears away from its current position seems almost trivial in comparison) Gott tells about it all in a matter of fact way that makes you believe that it could actually be done. I don't think you will ever get used to universes, where you meet yourself after having travelled around cosmic strings or black holes. But if so, in the grand finale we are presented with a space time with a beginning but without an earliest event. Here the universe (ours) causes itself. Perhaps some will be pleased with this as a an explanation of everything - I still think one could ponder why there is a universe instead of nothing. Having been far back in time Gott obviously wants to reflect on the future as well. I don't particular buy into his arguments here, and would rather have heard some more about the time machines. Still, all in all the book is a good read. October 2001. Simon Laub