http://www.seds.org/billa/tnp
Billed as a multimedia tour of the Solar System, Bill Arnett’s Web site, The Nine Planets, offers 90 pages of information about Earth, its planetary kin, and their satellites. Aimed at the nonspecialist, the site not only describes the latest scientific theories about the planets, but also covers more arcane snippets, such as how to pronounce the name of Saturn’s third largest satellite, Iapetus.

http://www.discoverengineering.org
Discover Engineering Online seeks to encourage children to pursue careers in engineering and to celebrate the achievements of the world’s engineers. The richly illustrated Web site, which was put together by a team led by the Eastman Chemical Co, emphasizes the importance, creativity, and variety of engineering.

http://ParticleAdventure.org
From Lawrence Berkeley National Laboratory’s particle data group comes The Particle Adventure, an educational Web site about fundamental particles and forces. Available in English, French, Polish, Slovak, and Spanish, the site guides its readers down three paths: “Standard Model,” “Experimental Evidence,” and “Beyond the Standard Model.”