Perhaps the greatest physicist of the second half of the 20th century, Richard Feynman changed the way the world thinks about quantum mechanics. On April 7 a 7 p.m., theoretical physicist and best-selling author Lawrence M. Krauss will be at D.G. Wills Book to discuss and sign his biography on the scientific spearhead. In “Quantum Man: Richard Feynman’s Life in Science,” Krauss tells how Feynman revolutionized the world’s understanding of nature amid a turbulent life. From the death of his childhood sweetheart during the Manhattan Project to his reluctant rise as a scientific icon, the author provides a new understanding of the legacy of a man who has fascinated millions. D.G. Wills books is located at 7461 Girard Ave., and the event is free with a book purchase. Information is available by calling (858)456-1800.