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Nature 457, 540 (29 January 2009) | doi:10.1038/457540a; Published online 28 January 2009

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Can robots have a conscience?

Peter Danielson1

BOOK REVIEWEDMoral Machines: Teaching Robots Right from Wrong

by Wendell Wallach and & Colin Allen

Oxford University Press: 2008. 288 pp. $29.95

Artificial moral agents do not exist but are easily imagined: driverless trains that choose to turn away from a track on which five engineers are working, or autonomous armed drone aircraft that can distinguish between legitimate and unsanctioned targets. In Moral Machines, ethicist Wendell Wallach and philosopher Colin Allen pose three questions: "Does the world need artificial moral agents?