Elementary Particles and the Laws of Physics: The Reason for Antiparticles, Richard Feynman
The 1986 Dirac Memorial Lecture presented by Richard Feynman.
Paul Dirac predicted the existence of antiparticles, and Richard Feynman explains now why there must be antiparticles. He lectures about particles, quantum theory, and relativity. A special pleasure is watching Feynman’s personal style of lecturing: his humor, his showmanship, and his brilliance.