Sparticl: is a new web and mobile service for teens, a collection of the best the web has to offer in science, technology, engineering, and math or STEM.
Teachers' Domain - Teachers' Domain is a free digital media service for educational use from public broadcasting and its partners
Sumanas Animations - animations for Biology, Chemistry, Environmental Science, etc.
PhET Simulations - excellent simulations for Science and Math at all grade levels
CSI: The Experiance - forensic science
Exploratorium - the museum of science, art and human perception
SciQ SciQ brings science to life for all ages of Alberta students, teachers and parents by making learning real, engaging and compelling through the integration of broadcast television and web technologies while also considering future technology.
Chem 4 Kids The title says it all.
Chemical Elements.com An online, interactive periodic table of the elements. Atomic structure diagrams are featured.
Cells Alive An outstanding site featuring cell structure, mitosis and meiosis, using QuickTime and a huge gallery of images.
edHelper.com Lesson plans, worksheets and WebQuests.
Energy Matters How many types of energy are available and which is best? At this site you can read about fossil fuels--coal, wood, oil and natural gas--or learn the difference between nuclear fission and fusion. Solar, wind, and geothermal are also covered.
Explore Science This site is a treasure trove of interactive, multimedia activities. Shockwave is required.
Exploratorium Another excellent source of online activities.