A Science Odyssey [ Teens/Mature Teens ] - Presents the people and the discoveries of 20th century science and technology in a variety of accessible, and interactive Web features. Based on the PBS television series. http://www.pbs.org/wgbh/aso/

Activities and Quizzes on Science [ Kids/Teens ] - Activities, games, and quizzes on a variety of science topics. Wonderful study aid for children aged 9-13. http://www.syvum.com/squizzes/science/

Adventures in Science and Technology [ Kids ] - Introduces chemistry, physics, biology, engineering, and computer science. In English and French. http://collections.ic.gc.ca/science/

Alaska Science Forum [ Teens/Mature Teens ] - Groups of articles on a wide array of topics, like volcanos, geology, living in the North, bugs, weather, and pets. Lots of weird facts. http://www.gi.alaska.edu/ScienceForum/

Ask Dr. Universe [ Kids ] - All sorts of big and small questions are answered here, and include things that puzzle kids worldwide. http://www.wsu.edu/DrUniverse/

Athena [ Kids/Teens/Mature Teens ] - Illustrated descriptions and activities on Earth Science and Space. Includes links to related materials and suggested learning activities. http://vathena.arc.nasa.gov/

Atoms and Ants [ Kids ] - A resource site of science and nature fun activities, strange facts, photos, illusions and products. Interesting stuff for both kids and parents. http://www.atomsandants.com/

BBC Science & Nature [ Kids/Teens/Mature Teens ] - Useful information about humans, animals, space and the planet we live on. Includes quizzes, picture galleries, games, and news stories. http://www.bbc.co.uk/sn/

Beakman and Jax [ Kids/Teens/Mature Teens ] - Comics, experiments, and interactive activities that answer questions like 'Why is the earth round?' and 'How do CDs work?' http://www.bonus.com

Beakman's World [ Kids ] - Answers to kids' science questions and fun science demonstrations for kids to do. http://www.beakman.com/

Bill Nye the Science Guy [ Kids ] - Check out the daily demo, watch a video clip or listen to an audio clips, and learn more about Bill Nye himself. http://billnye.com/

CAGIS - Canadian Association for Girls In Science [ Kids/Teens ] - Club for girls who get together with women scientists and do fun experiments. Site also has games and experiments to do at home. http://publish.uwo.ca/~cagis/

Careers in Life Science Information for Students [ Mature Teens ] - Links to sites offering information about various science careers, mostly in the life sciences, but also including astronomy. http://www.the-aps.org/education/k-12misc/careers.htm

Cool Science [ Kids/Teens ] - Energy-related science information for kids -- plus resources for teachers. Includes 'Ask a Researcher' feature. http://www.netl.doe.gov/coolscience/index.html

Discovery Kids [ Kids/Teens ] - Delivers informative articles, online games, a chat room, online science games, live web cams, showcase of video clips, and a station guide. http://kids.discovery.com/

Discovery School: A-to-Z Science [ Kids/Teens ] - Offers homework help, articles, interactive activities, virtual tours, science fair ideas, and projects for kids. http://school.discovery.com/students/

EOA Internet Campus [ Teens/Mature Teens ] - Includes activities about the earth, space, oceans and water, weather and climate, physics and chemistry, and geography and mapping. [Requires Macromedia Flash Shockwave and Apple Quicktime]. http://www.eoascientific.com/campus/

Exploratorium Science Snacks [ Kids/Teens ] - Miniature versions of some of the most popular exhibits at the Exploratorium. http://www.exploratorium.edu/snacks/snackintro.html

Funky Lab [ Kids/Teens ] - Presents a mix of science information and activities, from toilets to steam engines. Includes quizzes, games, videos and articles on the science and the history of science. http://www.funkylab.co.uk/

Girls Reaching Out With Science [ Teens ] - Pairs middle school girls in Columbus, Ohio, with mentors at Capital University to study science. http://capital2.capital.edu/orgs/GROWS/