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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. THE NATIONAL ACADEMIES PRESS 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 competencies and with regard for appropriate balance. This study was supported by Contract No. CNST-1-02-03-B between the National Academy of Sciences and the National Science Foundation. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the agency that provided support for the project. A PDF is available at www.nap.edu. Limited copies are available from: Board on Science, Technology, and Economic Policy National Research Council 500 Fifth Street, N.W. Washington, D.C. 20001 Phone: 202-334-2200 Fax: 202-334-1505 Copyright 2005 by the National Academy of Sciences. All rights reserved.
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