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Apollo at 50: The Lasting Effect of Exploration of the Lunar Surface on Our Current Exploration of the Moon

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Why don't I fall out when a roller coaster goes upside down?

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Health of the U.S. Presidents

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Science Reference Services (part of the Science, Technology and Business Division) is the principal location for research in the areas of science, technology, technical reports, and standards.
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  The Library of Congress >> Researchers
   August 15, 2019
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