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Everyday Mysteries: Fun Science Facts from the Library of Congress
This site provides answers to questions that "deal with everyday phenomena that we often take for granted, but ... can be explained scientifically. ... All of the questions presented on this Web site were asked by researchers and answered by librarians from the Library's Science Reference Services." Searchable and browsable; links to the library's "Ask a Librarian" feature.
http://www.loc.gov/rr/scitech/mysteries/

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