The winner of the Nobel Prize in Physics in 1965, Richard Feynman, was one of the world's greatest theoretical physicists, but he was also a man who often leaped into adventures. An artist, money thief, practical joker, and storyteller, Feynman's life was a series of explosive combinations that enabled his unique blend of high intelligence, unyielding curiosity, and eternal skepticism. Over the years, Feynman's conversations with his friend Ralph Leighton were first recorded on tapes and then transcribed as they appear here, slightly altered from their spoken form, offering a wise, funny, passionate, and utterly honest self-portrait of one of the greatest people of our time.