Book excerpt: Machinery of Mind is a full-scale, indispensable examination of the history, content, politics, and philosophy of Artificial Intelligence. In detail, consecutively but with a keen awareness of the interdisciplinary nature of the field, Johnson traces the history of the burgeoning science from its earliest practitioners to corporation-funded engineers and experts: Roger Schank, Terry Winograd, Doug Lenat and others who are struggling to create machines that can actually think independently, going beyond man-made programs and "games." Johnson presents the counterarguments of some theorists that intelligence is less than soul and that the "new science" moves arrogantly into dangerous territory. Necessarily inconclusive, this fascinating study is clear, comprehensive, richly detailed, and endlessly provocative.