Brian Greene/String Theory

For years physicists have been struggling to come up with one unifying principle that explains what things are made of—everything from black holes to the pencil on your desk. Could string theory be the answer? In this hour, we'll talk with theoretical physicist Brian Greene, author of "The Elegant Universe," about superstrings and the quest for the ultimate theory. Guests: Brian Greene Author, "The Elegant Universe: Superstrings, Hidden Dimensions and the Quest for the Ultimate Theory" (W. W. Norton) Professor of Physics and Mathematics Columbia University New York, New York

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