There is an ill-concealed skeleton in the closet of physics: "As they  are currently formulated, general relativity and quantum mechanics cannot both be right."  Each is exceedingly accurate in its field: general relativity explains  the behavior of the universe at large scales, while quantum mechanics  describes the behavior of subatomic particles. Yet the theories collide  horribly under extreme conditions such as black holes or times close to  the big bang. Brian Greene, a specialist in quantum field theory,  believes that the two pillars of physics can be reconciled in  superstring theory, a theory of everything.
Superstring theory has  been called "a part of 21st-century physics that fell by chance into the  20th century." In other words, it isn't all worked out yet. Despite the  uncertainties—"string theorists work to find approximate solutions to  approximate equations"—Greene gives a tour of string theory solid  enough to satisfy the scientifically literate. Amazon
E-book version: The Elegant Universe by Brian Greene  
Files size: 450 MB
Format: MP3, 64 kbps/Prefaces read by the author
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The Elegant Universe - Brian Greene (Audiobook)
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