"What started out as Sal making a few algebra videos for his cousins has grown to over 2,100 videos and 100 self-paced exercises and assessments covering everything from arithmetic to physics, finance, and history. Some educators post links to his site to reinforce practice and instruction for their students."
Source:"Browse the Library." Khan Academy. 27 April 2011. Web. http://www.khanacademy.org/#browse.
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