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Search over 200 individual encyclopedias and reference books from the worlds most trusted publishers. Find facts, videos, and pictures on various topics, from history and science to culture and arts.
- Earth and Environment
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- Literature and The Arts
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- Earth and Environment
10,000+ articles. 1,000+ articles. 100+ articles. Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Welcome to Wikipedia. , the free encyclopedia that anyone can edit. 6,822,679 articles in English. From today's featured article. Leucippus was a Greek philosopher of the 5th century BCE. He is credited with founding atomism, with his student Democritus.
Encyclopedia Britannica is a comprehensive and authoritative online reference source that covers a wide range of topics in history, science, arts, and culture. Explore articles, quizzes, videos, and more on Britannica's website.
Infoplease is a free, authoritative, and respected reference for Internet users that provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus.
Wikipedia is a free content, multilingual online encyclopedia written and maintained by a community of volunteer contributors, known as Wikipedians, through a model of open collaboration. It is the largest and most-read reference work in history. [10]
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The free online history encyclopedia with fact-checked articles, images, videos, maps, timelines and more; operated as a non-profit organization.