Effective field theory : the Standard Model, supersymmetry, unification -- Phenomenology of the Standard Model -- The Standard Model as an effective field theory -- Anomalies, instantons, and the strong CP problem -- Grand unification -- Magnetic monopoles and solitons -- Technicolor : a first attempt to explain hierarchies -- Supersymmetry -- A first look at supersymmetry breaking -- The Minimal Supersymmetry Standard Model -- Supersymmetric grand unificiation -- Supersymmetric dynamics -- Dynamical supersymmetry breaking -- Theories with more than four conserved supercharges -- More supersymmetric dynamics -- An introduction to general relativity -- Cosmology -- Astroparticle physics and inflation -- String theory -- The peculiar history of string theory -- The bosonic string -- The superstring -- The heterotic string -- Effective actions in ten dimensions -- Compactification of string theory I : Tori and orbifolds -- Compactification of string theory II : Calabi-Yau compactifications -- Dynamics of string theory at weak coupling -- Beyond weak coupling : non-perturbative string theory -- Large and warped extra dimensions -- Where are we headed? -- Appendix A : two-component spinors -- Appendix B : Goldstone's theorem and the pi mesons -- Appendix C : some practice with the path integral in field theory -- Appendix D : the beta function in supersymmetric Yang-Mills theory.