You don't need to know any physics at all to read this book. It is a set of short stories more about psychological than physical time. I found it quite poetic and thought provoking. Each story is something Einstein could have dreamed as he explored the nature of time; in most, time goes at different rates depending on something else, such as which town you are in. In each, the author explores how that would affect the relationship between people. If you think carefully, you will realize that this is exactly what happens in our own universe.