## Four 1975 Lectures by Paul Dirac

Slobodan Perovic (via Chris Joas) pointed this gem out to me. Four wonderful lectures given by Paul Dirac in 1975, on various topics in the foundations of quantum theory and cosmology.

“Quantum Mechanics”

“Quantum Electrodynamics”

“Magnetic Monopoles”

“Large Number Hypothesis”

###### Update

21 June 2013: Ed at Animated Physics has made a very helpful table of contents page for these videos, locating the times of each topic discussed in Dirac’s lecture.