MathWorld
http://www.mathworld.wolfram.com
Online encyclopedia of mathematics. Articles and terms are crosslinked and range from a short definition to a full-length article. A unique, dynamic, interactive reference source for math.
Math DL
http://www.mathdl.org
The Mathematical Association of America's Digital Library is an outstanding source for educators and students of mathematics. Includes peer-reviewed, classroom-tested materials for educators and ready-to-use curriculum sections. An essential source for students and faculty.
PlantFacts
http://www.plantfacts.osu.edu
This search engine, developed by Ohio State University, searches >60,000 pages of agricultural extension fact sheets from >40 U.S. and Canadian universities and government research centers. Includes nearly 5,000 photos and 200 video clips of various plant species.
Astrobiology Magazine
http://www.astrobio.net
An excellent source for information onthe discussion of life forms on other planets.
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