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Infotrac

California State Science Fair
USGS Earthquake Hazards -- Program Shows current earthquake activity 
How Volcanoes Work
How Products are Made - from Accordion to Zirconium, plus biographies of their makers.
Periodic Table of the Elements
Robotics: Sensing Thinking Acting from the Tech Museum of Innovation in San Jose
Amusement Park Physics -- Learn about and design roller coasters, carousels and more 
The Planets
Windows to the Universe

Brightstorm - Free math videos that cover topics from Algebra through Calculus.
Math2.org -- Includes basic math, as well as geometry and algebra formulas
Mathographies -- Biographies of mathematicians
Ask Dr. Math -- Answers to math questions at all levels

Kids' Planet -- Especies Fact Sheets Facts about Endangered Species
Bird Watchlist -- At-risk bird population statistics, from Audubon
EEK! -- Environmental Education for Kids -- Puzzles & Games
U.S. Environmental Protection Agency Explorers Club

Scanning Electron Microscope from Boston's Museum of Science
Bugbios -- Information and photos of all sorts of insects
Chimpanzee Central from the Jane Goodall Institute

California Wildflowers -- Descriptions and colorful photos...You can even search by color!