Ray Kurzweil's new book, "The Age of Spiritual Machines: When Computers Exceed Human Intelligence," is available from Penguin Putnam, Inc. Online and Amazon.com.
Robert Freitas' comprehensive technical book, "Nanomedicine, Volume I," is now available in hardcover from Landes Biosciences, and is on the web at www.nanomedicine.com.
"Nanosystems: molecular machinery, manufacturing, and computation" by K. Eric Drexler (576 pp., 200+ illustrations. Wiley Interscience, 1992, hardcover or paperback).
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