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Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Encyclopedia of Earth Welcome to the Encyclopedia of Earth, an electronic reference about the Earth, its natural environments, and their interaction with society. The Encyclopedia is a free, fully sea ...

Because we only have the one planet Earth... WWF believes that, together, we must save endangered species, conserve natural environments and live sustainable lives.

World Wildlife Fund - The leading organization in wildlife conservation and endangered species.

A History of the World. A Collection Of World History Related Essays, Documents, Maps and Music From World History.

Reporting our world daily: original nature and science coverage from National Geographic.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. Despite being the work of one man, Salman Khan, this 1600+ video library is the most-used educational video resource as measure...

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

ushistory.org, created and hosted by the Independence Hall Association in Philadelphia. Colonial and Revolutionary history centered in Philadelphia, PA