Some of the brightest minds in science have passed through the halls of the California Institute of Technology. In the early 1980s, Leonard Mlodinow joined their ranks to begin a postdoctoral fellowship. Afraid he was not smart enough to be there, despite his groundbreaking Ph.D. thesis, he took his insecurities to Richard Feynman, Caltech's intimidating resident genius and iconoclast. So began a pivotal year in a young man's life. Though a series of fascinating exchanges, Mlodinow and Feynman delve into the nature of science, creativity, love mathematics, happiness, God, art, pleasures and ambition, producing a moving portrait of a friendship and an affecting account of Feynman's final creative years.