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DAVID BOHM鈥檚 last great work on quantum theory 鈥� the definitive account of his ideas 鈥� The Undivided Universe, written with B. J. Hiley, is now available in paperback from Routledge (pp 297, 拢12.99). Experiments in the 198Os showed that you cannot have both 鈥渞eality鈥� and 鈥渓ocality鈥� in the quantum world. Either communication occurs faster than light, and particles are real, or communication faster than light is forbidden, and we are stuck with collapsing wave functions and half-dead cats. Bohm argued for 40 years that the world is nonlocal, and recent work, such as that by John Cramer in Seattle, leans the same way. An important, forward-looking book 鈥� but, it must be said, highly technical in parts.