"Machines who think--how utterly preposterous," huff beleaguered humanists, defending their dwindling turf. "Artificial Intelligence--it's here and about to surpass our own," crow techno-visionaries, proclaiming dominion. It's so simple and obvious, each side maintains, only a fanatic could disagree. Deciding where the truth lies between these two extremes is the main purpose of John Haugeland's marvelously lucid and witty book on what artificial...