Leonard Susskind discusses the equations of motion of fields containing particles and quantum field theory, and shows how basic processes are coded by a Lagrangian. (December 3, 2009)

Leonard Susskind discusses the theory and mathematics of particle spin and half spin, the Dirac equation, and isotopic spin. (November 16, 2009)

Leonard Susskind discusses the theory and mathematics of angular momentum. (November 13, 2009)