Thomas H. Newman to Richard P. Feynman, November 11, 1985 / Richard P. Feynman to Thomas H. Newman, November 19, 1985 / Richard P. Feynman to Michael Isaacson, December 20, 1985 by Michelle Feynman & Thomas H. Newman narrated by Johanna Parker / Richard P. Feynman narrated by Richard Poe