Can the Laws of Physics Be Unified?

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Science  01 Jul 2005:
Vol. 309, Issue 5731, pp. 82
DOI: 10.1126/science.309.5731.82

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Nobody has yet come up with a convincing way to build a single theory that includes all the particles, the strong and electroweak forces, and gravity all in one big bundle. But physicists do have some leads; perhaps the most promising one is superstring theory.