2. Natural Sciences and Mathematics 
Directory of the Virtual Library, an expert-run catalog of natural sciences and mathematics sections of the web.
http://vlib.org/Science
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3. Extreme Science
cool world records in earth science and the creature world that you want to see; plus there's some cool stuff on space science and exploration, links to real-time, real-live science data, and the best science on the web
http://www.extremescience.com
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| 2007-12-01
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4. Science.gov
FirstGov for Science is a gateway to government science information provided by US Government science agencies, including research and development results.
http://www.science.gov
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| 2007-12-01
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5. Science News Online
Weekly magazine offers featured articles from the current issue along with special online-only features
http://www.sciencenews.org
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| 2007-12-01
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6. Science Direct
An information source for scientific, technical, and medical research. Subscription required for some sections
http://www.sciencedirect.com
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| 2007-12-01
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