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• The Catholic Encyclopedia
• Earth & Sky Transcripts of the daily science radio series covering astronomy, environmental science, geology, biology and related topics.
• Encyclopedia Britannica Limited Search Search the entire database of Britannica Online. Full access to the articles is available to subscribers only.
• How Stuff Works Answers questions about everyday things we have wondered about but weren't sure where we would find the answers. With easy-to-understand graphics.
• Information Please Find answers and articles in IP's almanacs, encyclopedia, and dictionary.
• Questions and Answers from the Old Farmers Almanac