What started out as Sal Khan making a few algebra videos for his nieces and nephews has grown to over 2000 videos and 100 self-paced exercises and assessments covering everything from arithmetic to physics, finance, and history. Recently profiled in Bloomberg BusinessWeek report :The Math of Khan Salman Khan is the recipient of a $1.5 million donation from The Bill & Melinda Gates Foundation. All of the Khan tutorials are free and available on the web.
To learn more visit the Khan Academy.
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