For more than thirty years, Richard P. Feynman’s three volume Lectures on Physics has been known worldwide as the classic resource for students and professionals alike. Ranging from the most basic principles of Newtonian physics through such formidable theories as Einstein’s general relativity, superconductivity, and quantum mechanics, Fenyman’s lectures stand as a monument of clear exposition and deep insight. Responding to the tremendous clamour for the original audio tapes from which the Lectures on Physics were transcribed, Perseus Books is releasing Feynman’s original recordings, remastered for modern audio equipment and re-organized for cohesiveness and convenience. All 111 lectures will be available over the coming years.