Mr. Calder has done an outstanding job writing a book about relativity that non-physicists can read and enjoy. Mr. Calder writes with such clarity, such tangible descriptions, and such succinct summaries of the theory that the reader can begin to incorporate the implications of the theory into one's own worldview.
For instance, the author devotes much time and energy describing the possibilities of the universe being either open or closed (essentially, will the universe expand indefinitely, or will it eventually contract). By the time Mr. Calder begins to describe the metaphysical implications of these possibilities, the conscientious reader is already prepared to explore them on his own.
This ability to communicate science with such clarity as to allow a lay reader, whom I certainly am in physics, to be able to consider the implications of science, is a great complement to the author. Unfortunately, I am a hostage to much of what I read in science, so often having to rely on the author to describe the science as well as its implications.
In addition to summarizing and communicating extremely difficult material very well, Mr. Calder also writes with a great deal of energy and excitement. The author clearly shares his excitement about the subject matter to the reader.
This is an excellent read for anyone interested in the history of science and its implications.