Example image of eyePlorer eyePlorer map for 'M-theory': String theory Theoretical physics Superstring theory Membrane (M-Theory) Coupling constant Supersymmetry Type II string theory A dynamical theory of the electromagnetic field Electromagnetism James Clerk Maxwell Maxwell's equations Associativity Lie algebra E8 (mathematics) Heterotic string Orthogonal group Type I string theory Planck length Spacetime General relativity Quantum mechanics T-duality Classical physics S-duality Strong interaction Weak interaction BBC TLC (TV channel) Michael Duff Michio Kaku Neil Turok The Elegant Universe Ashoke Sen Ur Über Joseph Polchinski University of California, Santa Barbara D-brane Graviton Electromagnetic force Gravitation Knot Knot theory Topology Orientability Torus Supergravity Leonard Susskind Matrix string theory Stephen Shenker