Websites directory, general web directory offers searchable links, categories, listings, organized by topic.

Encyclopedias

Encyclopedias Directory
Includes the Columbia Encyclopedia and thesauri.
http://www.bartleby.com/
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Tags: Bartleby
Electronic encyclopedia with its own content and links to the best reference sites on the Internet.
http://www.encyberpedia.com/
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Articles with explanations on how hundreds of things work, from elements of the human body to space technology.
http://www.howstuffworks.com/
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Tags: How Stuff Works