The Quantum Challenge, Second Edition is an engaging and thorough treatment of the extraordinary phenomena of quantum mechanics, and of the enormous challenge they present to our conception of the physical world. Traditionally, the thrill of grappling with such issues is reserved for practicing scientists, while physical science, mathematics, and engineering students are often isolated from these inspiring questions. This book was written to remove this isolation. Greenstein and Zajonc present the puzzles of quantum mechanics using vivid references to contemporary experiments. The authors focus on the most striking and conceptually significant quantum phenomena, together with a clear theoretical treatment of each. The depth and extent of the challenge of quantum mechanics becomes increasingly compelling as they move from the simplest experiments involving single photons or particles, to the famous Einstein-Podolsky-Rosen and Bell's Theorem, and then to macroscopic quantum phenomena.