For more than thirty years, Richard P. Feynman’s three-volumeLectures on Physicshas 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, Feynman’s lectures stand as a monument of clear exposition and deep insight. Responding to the tremendous clamor for the original audio tapes from which theLectures on Physicswere transcribed, Persues Books is releasing Feynman’s original recordings, remastered for modern audio equipment and re-organized for cohesiveness and convenience. Timeless, and collectible, these tapes will serve as a comprehensive library of essential physics by a legend in science.The first two sets of recordings of Feynman’s landmarkLectures on Physicscomprise a beginning and an advanced course on quantum mechanics, respectively.Volume 2 makes up a course inAdvanced Quantum Mechanicsand includes chapters on symmetry in physical laws, identical particles, symmetry and conservation laws, the hydrogen atom and the periodic table, and the Schrödinger equation in a classical context (this chapter also includes a seminar on superconductivity).