These lectures were presented by Nobel laureate Richard Feynman to his physics class at the California Institute of Technology in the 1960s, and are considered a masterpiece of physics exposition by o...These lectures were presented by Nobel laureate Richard Feynman to his physics class at the California Institute of Technology in the 1960s, and are considered a masterpiece of physics exposition by one if its greatest teachers. (The the audio for these lectures is also available on CD, in 20 volumes.) The chapter “The Rediscovery of Gravity” by Roger Penrose gives a brief overview of general relativity at about the level of this course.