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Science  18 Feb 2000:
Vol. 287, Issue 5456, pp. 1163
DOI: 10.1126/science.287.5456.1163d

Mother Earth. Plate tectonics, food webs, remote sensing, La Niña, acid rain, Mercator maps: They're all covered in this introductory Web book on physical geography, a field that ranges from geology to ecology. The site also has a handy glossary and loads of related links.

Galileo stash. Galileo Galilei's 436th birthday was this week, making it an apt time to visit The Galileo Project, a monstrous stack of documents on this and other early astronomers. You can pore over the first drawings of sunspots, bone up on the history of the telescope, or read letters from Galileo's daughter. A database offers biographies of over 600 16th and 17th century scientists.

Universal index. Claiming to be the “world's most complete education index,” this site links to over 5300 universities and colleges worldwide, from Indiana University to the Indian Institute of Technology in Bombay.

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