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Eric Weisstein's World of Science
Includes extensive encyclopedias of astronomy, chemistry, mathematics, physics, and scientific biography. Entries include definitions, diagrams, formulas, cross-references, and related resources. Searchable, and browsable alphabetically or by topic. Also has a "random entry" feature. The author is a scientist with advanced degrees in physics and planetary science.
http://scienceworld.wolfram.com/

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