Khan Academy
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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.
http://www.khanacademy.org/
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mudra
Last edited by mudra on Mon Apr 30, 2012 8:53 am; edited 1 time in total