M-theory
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M-theory is a theory conjectured by Edward Witten of the Institute for Advanced Study, that would unify the five different superstring theories: Type IIA string theory, Type IIB string theory, Heterotic string theory, SO(32) string theory, and heterotic E8×E8 string theory; all of these seemingly different string theories are simply limiting cases of the M-theory. Edward Witten has used M-theory to explain a number of observed dualities, such as the T-duality, U-duality and S-duality. The discovery of M-theory is hailed by string theorists as the second superstring revolution.