This is an exceptionally accessible, accurate, and nontechnical introduction to quantum mechanics. After briefly summarizing the differences between classical and quantum behavior, this engaging account considers the Stern-Gerlach experiment and its implications, treats the concepts of probability, and then discusses the Einstein-Podolsky-Rosen paradox and Bell's theorem. Coverage introduces the quantal interference and the concept of amplitudes, and also reveals the link between probabilities and the interference of amplitudes. Final chapters explore exciting new developments in quantum...