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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 summary 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. This project was supported by the Alfred P. Sloan Foundation, Chinese Academy of Sciences, IAP - The Global Network of Science Academies, U.K. Global Partnership Programme, U.S. Defense Threat Reduction Agency, U.S. Department of State, U.S. National Institutes of Health, and U.S. National Academies. The views expressed herein are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project. International Standard Book Number-13: 978-0-309-20929-8 International Standard Book Number-10: 0-309-20929-3 Additional copies of this summary are available from the National Academies Press, 500 Fifth Street, N.W., Lockbox 285, Washington, D.C. 20055, (800) 624-6242 or (202) 334-3313 (in the Washington metropolitan area); Internet, http://www.nap.edu. Copyright 2011 by the National Academies. All rights reserved. Printed in the United States of America.
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