World Book Online for Kids is the premier general reference Web site developed especially for younger users.
World Book Student, includes the articles of the World Book Encyclopedia, a Biography Center, dictionary, atlas, an extensive multimedia collection, thousands of editor-selected Web sites, correlations to curriculum standards, and much more.
Enciclopedia Estudiantil Hallazgos is the optimal beginner’s Spanish language reference site.
PebbleGo Animals has lots of information on a variety of animals and habitats, and has some useful adaptive tools.
PebbleGoNext Science is geared for 3-6 grades, and has several articles on science topics, as well as experiment videos and science related games.