Environmental Literacy Council - Over 1000 pages of background information and resources with curriculum materials and textbook reviews
Frank Potter's Science Gems - Links to resources by sciences and topics
IPL: Sciences and Technology - Annotated links to web pages about all aspects of science and technology
How Stuff Works - Shows how many familiar objects work
Math and Science Gateway - Links to resources in science and mathematics for educators and students in grades 9-12
National Science Foundation - An overview of the NSF's research and current science news
refdesk.com Science and Technology - Links to dozens of varied science sites
Science Daily - Science news updated daily
John F. Kennedy Space Center - Electronic images of the pre flight, launch, and landing activities conducted for space shuttle missions
Fundamental Physical Constants - Everything from Avogadro number to von Klitzing constant, arranged by category
Who Dunnit? - Forensic science resources and activities
School Science Fairs Homepage - "This homepage is designed to aid students in the most difficult aspect of their science fair experience; getting an idea."
Inside Cancer - Multimedia guide to cancer biology
The Ultimate Science Fair Resource - Ideas, information, help, links, and projects
The Franklin Institute Science Museum - One of the top science museums in the U.S.
NASA - Materials that engage student interest in science, technology, engineering, and math
Fun Science Gallery - "Fun, simple, low cost science experiments for amateur scientists!"