Encyclopedias, almanacs, dictionaries, statistics, and other sites for quickly looking up facts.

• Infoplease.com: Information Please Almanac, atlases, and more.
• Wikipedia: "The free encyclopedia that anyone can edit."
• OneLook Dictionary Search: Look up words in almost 1000 online dictionaries at the same time.
• IllinoisAtlas.com: A collection of Illinois and U.S. statistical maps.
• World Factbook: The CIA's book of country profiles.