Voorblad -- Titel Page -- Copyright -- Contents -- Introduction -- The tautological toolkit -- Rise and fall The logistic equation -- Mechanics and gravity Newton's dynamical equations and universal law of gravity -- The electromagnetic force The Lorentz force law -- A local conservation law The continuity equation -- Electrodynamics The Maxwell equations -- Electromagnetic waves The wave equations -- Solitary waves The Korteweg-De Vries equation -- Thermodynamics The three laws of thermodynamics -- Kinetic theory The Boltzmann equation -- Hydrodynamics The Navier-Stokes equations -- Special relativity Relativistic kinematics -- General relativity The Einstein equations -- Quantum mechanics The Schrödinger equation -- The relativistic electron The Dirac equation -- The strong force Quantum chromodynamics -- Electro-weak interactions The Glashow-Weinberg-Salam model -- String theory The superstring action -- Back to the future A final perspective.