Susskind's series thusfar is quite simply the best popsci out there. Instead of providing a caricature of the theories like books such as Greene's Elegant Universe do, Susskind's books tell you what the theories actually say and they do so in such a way that they are accessible to the lay man. The Quantum Mechanics edition is no exception.<br><br>In this volume, Susskind delves into Quantum Mechanics. He uses a single type of state throughout the book to minimize the messiness of the mathematics. This book is only talking about spin, but the methods extend to the other states. He even has multiple chapters on the weirdest of quantum phenomena: entanglement.<br><br>While I, and the author, strongly suggest reading the first volume before the second, this is the best lay introduction to QM I have ever seen.