Available in Flash and non-Flash versions. Site has banner ads. This San Francisco museum of science, art and perception presents really neat interactive exhibits on astronomy, biology, the science behind sports, and much more. Bulletin board messages are screened before they are added to the Web site. At the Discovery Channel School you can use the online World Book encyclopedia for homework help and do experiments in the Science Fair Studio.
Site has ads.
This Museum presents a great collection of online exhibits about Antarctica, archaeology, electron microscopes, electricity, fractals, Leonardo Da Vinci, and more. Exhibits combine, images, text, activities, audio and slide shows to make learning fun. Uses Shockwave and Quicktime.