This book is about theoretical physics, relativity, superstrings, and the space-time loaf. Well, there isn't actually a space-time "loaf": rather, it's a highly effective metaphor -- a thought experiment -- that Brian Greene uses to get across the idea that in the mathematics of advanced physics, space-time isn't just an ephemeral construct but an actual something which has reality and which can be shown, mathematically, to possess that reality.
Greene goes on to show how, because of relativity and the specifics of relative motion, all slices of the space time loaf, no matter how wackily they may be sliced, will exist for all time, in all space in a "reality" of all-time-and-all-space that human beings, confined to our ephemeral existence, cannot perceive save for small, small slices. In other words, this moment, in which you're reading this review, shall always exist, frozen as it were-was-and-ever-will-be on an infinitesimally small part of the space-time loaf.
Don't believe me? Well then, read the book for Einstein's sake!
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