WikipediA, the multilingual open-content encyclopedia, a project started in 2001, already contains more than 230,000 articles. Based on the copyleft principle anyone can join the project, work on the information and improve it, thus creating a huge knowledge-database. This is the real power of the internet. And because people have (shared) ownership over their entries (or areas of competence), the information is updated very fast.
A nice feature is the anniversaries section. Related projects are the Wiktionary, WikiBooks, WikiQuote and WikiSource.

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