Trebuchet - Build your own and test it
http://www.globalspec.com/trebuchet/
October Sky: The Real Homer Hickam
http://www.homerhickam.com/
Discovery Channel
http://dsc.discovery.com/?clik=www_nav_dsc
Provides a look at the inner workings of the mundane (pencil, hair dryer) and
complex (brain, atomic clock). Great for science reports.
http://www.howstuffworks.com
Of the many periodic tables of elements sites on the Web, this one's
particularly well designed. It began as an eighth-grader's science project in
1996.
http://www.chemicalelements.com
Metric conversions of distance, area, weight, speed, temperature and more.
Also converts fractions to decimals.
http://www.sciencemadesimple.com/conversions.html
An interactive site from the University of Colorado at Boulder demonstrates
physics principles behind microwave ovens, X-rays, lasers and more.
http://www.colorado.edu/physics/2000/index.pl
The Periodic Table
http://center.acs.org/periodic/tools/PT.html
You might ask yourself... What's That Stuff?
Ever wondered about what's really in hair coloring, Silly Putty, Cheese Wiz,
artificial snow, or self-tanners? C&EN presents a collection of articles that
gives you a look at the chemistry behind a wide variety of everyday products.
http://pubs.acs.org/cen/whatstuff/stuff.html
NASA for middle-school students
http://www.nasa.gov/audience/forstudents/5-8/features/index.html
American Physical Science Organization
The football video on momentum and others.
http://www.aps.org/
Waves
http://www.classzone.com/books/ml_science_share/vis_sim/wslm05_pg18_graph/wslm05_pg18_graph.html