General and Reference

National Science Digital Library: http://nsdl.org

Science Master: www.sciencemaster.com

Howstuffworks (Science Channel): http://science.howstuffworks.com

Everyday Mysteries: Fun Science Facts from the Library of Congress: www.loc.gov/rr/scitech/mysteries/mysteries-home.html

Discovery Education's Science Fair Central: www.discoveryschool.com/sciencefaircentral

Discovery Channel Young Scientist Challenge: www.discovery.com/dcysc

Science Fair and Experiment Ideas

MIT's Invention Dimension:Fun Site for Kids: http://web.mit.edu/invent/r-archive-2.html

Exploration's Hands-on-Activities: www.exploratorium.edu/explore/handson.html

TryScience: http://tryscience.org/home.html

All Science Fair Projects: www.all-science-fair-projects.com

Miscellaneous

Sports Science in the Yahoo! Directory: http://dir.yahoo.com/Recreation/Sports/Science