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Wikipedia (Popularity: ): Free volunteer-edited encyclopedia with over 200,000 articles.
Encyclopedia.com (Popularity: ): Free resource offers more than 50,000 concise articles.
Encyclopaedia Britannica (Popularity: ): Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available.
How Stuff Works (Popularity: ): Articles explain how hundreds of things work, from elements of the human body to space-age technology.
World Book Encyclopedia (Popularity: ): Offers in-depth information on a variety of subjects and educational activities for children.
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Popular Sites |
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How Stuff Works (Popularity: ): Articles explain how hundreds of things work, from elements of the human body to space-age technology.
Encyclopaedia Britannica (Popularity: ): Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Free trial available.
Encyclopedia.com (Popularity: ): Free resource offers more than 50,000 concise articles.
Wikipedia (Popularity: ): Free volunteer-edited encyclopedia with over 200,000 articles.
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