CUNY professor and media star Kaku (Hyperspace) ponders topics that many people regard as impossible, ranging from psychokinesis and telepathy to time travel and teleportation. His Class I impossibilities include force fields, telepathy and anti-universes, which don't violate the known laws of science and may become realities in the next century. Those in Class II await realization further in the future and include faster-than-light travel and discovery of parallel universes.