The Reason for Antiparticles

This is the video of the lecture The Reason for Antiparticles by Richard P. Feynman. Paul Dirac, one of the most important physicists of the twentieth century, was a professor at the University of Cambridge, England. He held the chair that once was occupied by Isaac Newton. When he died in 1984, his college, St John's College in Cambridge, endowed an annua l lecture to be held in Cambridge in his memory. The first of these lectures was given by Richard Feynman and Steven Weinberg. Dirac was perhaps most famous for his prediction of antimatter, and in his lecture Feynman discusses the physical reality underlying Dirac's prediction. A book accompanies this tape which contains the transparencies used in the lecture (in Feynman's own handwriting), and pieces by Lawrence Krauss, John Gribbon , and Ralph Leighton. The print version of this lecture is available from Cambridge University Press. Profits from the sale of this video benefit cancer research. See the companion lecture by Steven Weinberg. NTSC version (North American standard).