NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This material is based on work supported by the National Science Foundation under Grant No. CTS-0096624. Any opinions, findings, and conclusions or recommendations expressed in it are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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Front cover: Three-dimensional scanning tunneling microscope image of a man-made lattice of cobalt atoms on a copper (111) surface. Courtesy of Don Eigler, IBM Almaden Research Center.

Back cover: A nanoscale motor created by attaching a synthetic rotor to an ATP synthase. Reprinted with permission of the American Association for the Advancement of Science from Soong et al., Science 290, 1555 (2000). © 2000 by AAAS.

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