The sequel to "In Search of Schrodinger's Cat", this book presents the improvements in experimental techniques that have enabled physicians to formulate and test new theories about the nature of light. The theories are described in the form of the fate of two small cats, separated at a tender age and carried to opposite ends of the universe. In this way the book introduces the reader to such new developments as quantum cryptography, in which codes that are permanently unbreakable can be made, and goes on to possible future developments, such as the idea that the "entanglement" of quantum particles could be a way to build a "Star Trek style" teleportation machine.