ATID Jewish Encyclopedia - [ Kids/Teens/Mature Teens ] - The Jewish Encyclopedia For Kids is made as an online educational site for children who are interested in Jewish facts and history.
Bartleby.com Reference - [ Kids/Teens/Mature Teens ] - Reference site allows you to search over the Columbia Encyclopedia, the Encyclopedia of World History, fact books, thesauri, quotes, and more.
Children's Encyclopedia of Women - [ Kids ] - Collection of articles about famous women written by third and fourth grade students.
Encyclopaedia Britannica - [ Teens/Mature Teens ] - Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available.
Encyclopedia Smithsonian - [ Kids/Teens/Mature Teens ] - Links to online Smithsonian resources and answers to frequently asked questions from A to Z.
Encyclopedia.com - [ Kids/Teens/Mature Teens ] - Free resource offers more tens of thousands of articles from multiple sources.
EncycloZine: Learning Fun! - [ Kids/Teens/Mature Teens ] - EncycloZine is a concise illustrated encyclopedic portal covering a wide range of topics in the arts, humanities, sciences, and technology. It also features games, puzzles, quizzes, and a multimedia gallery.
How Stuff Works - [ Kids/Teens/Mature Teens ] - Articles explain how hundreds of things work, from elements of the human body to space-age technology.
Instrument Encyclopedia - [ Kids/Teens/Mature Teens ] - A guide to more than musical 140 instruments from all parts of the world. Includes photographs and descriptions.
MSN Encarta Encyclopedia - [ Kids/Teens/Mature Teens ] - Includes a world atlas, dictionary, thesaurus, multimedia collection, and homework tools.
Open Site - [ Teens/Mature Teens ] - A volunteer-run open content encyclopedia, inspired by the Open Directory Project.
Spartacus Educational - [ Kids/Teens/Mature Teens ] - British online encyclopedia focuses on historical topics. Articles are geared toward students.
TechEncyclopedia - [ Kids/Teens/Mature Teens ] - Contains descriptions and definitions of more than 14,000 computer terms and concepts.
VetCentric Encyclopedia - [ Mature Teens ] - Find articles on animal health care topics ranging from behavior and preventive care to common and not-so-common diseases.
Wikipedia - [ Kids/Teens/Mature Teens ] - Free volunteer-edited encyclopedia with over 2.1 million articles.
