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Remarkably well written. This may be the best written science book I have ever read. It has all the qualities of good science writing: it is carefully organized; it has an implicit model of what the reader will be able to comprehend, and warns the reader when some material is perhaps too difficult, as well as making good use of footnotes; it fairly discusses issues which have not been settled, making clear where the author stands; it is up to date; it has a sense of humor and a lively style. What makes this book absolutely stand out, is its brilliant use of metaphor and image, both word images and illustrations. Having said all that, I am not particularly motivated to read other books in the same subject area: while Greene provides the reader with a real feel for the material, the understanding is necessarily superficial. In fact, I was happier with the latter, more exotic, part of the book than with the earlier more familiar material about relativity: Greene even got me comfortable with 4 and more dimensions of space. And it was nice to read, for my sanity, that all forces are implemented via actual movement of particles of force, be it photons or gravitrons (which Greene is certain exist and will be observed as our tools get better, and he is not prone to being dogmatic). One warning: for some reason, Green unaccountably delays mentioning that the probability concept used by quantum physicists does not really track conventional interpretations, wherein probabilities, being non-zero, cannot cancel each other.