1971 - 1980

A possible Theory of Everything is proposed.

The English physicist Michael Green and the American physicist John Schwarz extend "string" theory -- which treats elementary particles as vibrations of minute strings rather than as points in space -- into "superstring" theory. It incorporates a novel relationship called supersymmetry that places particles and force carriers on an equal footing. By 1997, superstring theory seems capable of uniting quantum mechanics with the theory of relativity to explain all known particles and forces including gravity, but remains experimentally untested.
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