Khan Academy

Tuesday, 10 November 2015 16:52 administrator
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1. https://www.khanacademy.org/

 
2. Salman Khan talk at TED 2011 | Conversations with Sal 
     https://www.khanacademy.org/talks-and-interviews/conversations-with-sal/v/salman-khan-talk-at-ted-2011-from-ted-com