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A perfectly good book on time using Einstein and Einstein's theory of relativity to explain how time is relative and how our perception of time is incorrect in many ways. The author, Paul Davies, seeks to illuminate questions such as whether time flows in one direction, whether time is it's own dimension, whether time existed before the big bang (or whether the big bang happened), whether time travel is possible, and whether time exists at the singularity of a black hole.

Davies uses physics, quantum mechanics, and Einstein's notion of space-time among other things to explore these questions and lay out what physicists have learned and know regarding time. It is reasonably well written and fairly easy to understand for non-science people, though Davies does explain some technical quantuim mechanics.

The only real issue I had with the book was that is was written in 1995 and it seems like the science has moved forward quite a bit since then. For instance, Brian Greene's The Fabric of the Cosmos: Space, Time, and the Texture of Reality which was published in 2005, takes this book at least a couple of steps further. So I do find it ironic that a book about the relativity of time is a bit outdated.

Oh yeah, one nit to pick. Several times in the book, Davies went off on a tangent and then wrote something like, "if you want to learn more about this, read my book "XYZ"" (or whatever the book's name). I found that annoying and classless. Don't market to me in the middle of a book. You know what Einstein (or Einstein theory explainer)? If i like you're writing, I'll seek out your other books, I don't need you upselling me mid chapter.