Physicists Debate the Merits of String Theory
Is string theory the answer to the last big questions in physics, or a dead end? While some physicists believe that string theory could lead to a unifying theory, detractors say it's sloppy and founded on unwarranted assumptions.
Lee Smolin, author of The Trouble with Physics; faculty member, Perimeter Institute for Theoretical Physics
Brian Greene, author of The Elegant Universe and The Fabric of the Cosmos; professor of mathematics and physics, Columbia University
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