Lewis H. Strauss to Richard P. Feynman, August 2, 1977 / Richard P. Feynman to Lewis H. Strauss, August 9, 1977 / Richard P. Feynman to Michael E. Fisher, November 15, 1977. Part 1 by Lewis H. Strauss narrated by Johanna Parker / Richard P. Feynman narrated by Richard Poe