Need definitions or facts about science? Try one of these.
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The Science Dictionary: a science search engine for definitions and summaries
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National Science Foundation: Find breaking news and research in science
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Encyclopedia of Life: Online encyclopedia for animals, plants, fungi, protists, and bacteria
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USDA Plants Database: Information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories
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PubChem: chemical information, chemical, and physical properties, biological effects, safety, and toxicity
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UCLA Science Information Life Cycle – Tutorial highlighting information production and dissemination in the sciences