* [Wikipedia | http://en.wikipedia.org/wiki/Main_Page]
** [Wikipedia Simple | http://simple.wikipedia.org/wiki/Main_Page]
* [Khan Academy | http://www.khanacademy.org/]
* [Coursera | https://www.coursera.org/]
* [Udacity | http://www.udacity.com/]

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[CategoryRecreation.Education]