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Begun in 2001, Wikipedia has rapidly grown into the largest reference website on the Internet. The content of Wikipedia is free, written collaboratively by people from all around the world. This website is a wiki, which means that anyone with access to an Internet-connected computer can edit, correct, or improve information throughout the encyclopedia, simply by clicking the edit this page link (with a few minor exceptions, such as protected articles and the main page).

Wikipedia is a registered trademark of the non-profit Wikimedia Foundation, which has created an entire family of wiki projects.

In every article, links will guide you to associated articles, often with additional information. You are welcome to add further information, cross-references, or citations, so long as you do so within Wikipedia's editing policies and to an appropriate standard.

Because Wikipedia is an ongoing work to which in principle anybody can contribute, it differs from a paper-based reference source in some very important ways. In particular, older articles tend to be more comprehensive and balanced, while newer articles may still contain significant misinformation, unencyclopedic content, or vandalism. Users need to be aware of this in order to obtain valid information and avoid misinformation which has been recently added and not yet removed.

Wikipedia is completely up-to-date, with articles on topical events being created or updated within minutes or hours, rather than months or years for printed encyclopedias." [Via wikipedia.org]