Nanotechnology, or molecular technology, involves the manipulation of individual atoms and molecules, something the human body already does.In Engines of Creation , Drexler attempts to predict, justify, quantify, and caution us about this important new field in engineering. His book could have been the first and foremost discussion of this fascinating subject. But Drexler strays from the topic with annoying regularity. He devotes too little space to the possibilities of nanotechnology and too much to esoteric and opinionated discussions of philosophy, politics, information science, defense, human relations, etc. Nanotechnology will indeed become a reality, and the public needs to be informed. It is therefore unfortunate that Engines of Creation was not written more clearly or directly.