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 E8ÃE8 string theory]]). Edward Witten has used M-theory to explain a number of observed dualities, such as the T-duality, U-duality and S-duality.