Lee Smolin
"It would be hard to imagine a better guide to this difficult subject.", -- Scientific American, In ,Three Roads to Quantum Gravity,, Lee Smolin provides an accessible overview of the attempts to build a final "theory of everything." He explains in simple terms what scientists are talking about when they say the world is made from exotic entities such as loops, strings, and black holes and tells the fascinating stories behind these discoveries: the rivalries, epiphanies, and intrigues he witnessed firsthand. , "Provocative, original, and unsettling." -- ,The New York Review of Books, "An excellent writer, a creative thinker." -- ,Nature 
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Three Roads To Quantum Gravity