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The world of HAL and Data, of sentient machines, is fast approaching. Indeed, in some ways it has already arrived, as humans incorporate bionic technology and as humanlike machines increasingly take on the work of humans. Rodney Brooks, a professor of engineering at MIT, has been involved in this transformation for decades. He has helped design robots that reason, at least after a fashion. The machines are as yet primitive, but, Brooks writes, in five years the boundary between what is now fantasy and fact will be breached, and intelligent machines will come into their own. With them will come a host of ethical problems, as we wrestle with the implications of Asimov's laws of robotics and with the very real possibility that we have created a new kind of slave. There's no way of getting around this future, it would seem, and, adds Brooks, our species will change in the bargain: "With all these trends we will become a merger between flesh and machines." Antitechnologists may shudder at the story line, but readers interested in the gee-whiz possibilities of the digital age will be fascinated by Brooks's vision of what is and what will be. --Gregory McNamee
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