Khan Academy
The Khan Academy offers over 1800 instructional videos covering everything from basic algebra to advanced chemistry, biology, and even the current day banking crisis. While working at an investment fund, Salman Khan started tutoring his younger cousins in his spare time by creating and posting videos to YouTube. As the videos grew in popularity, the Khan Academy was born. 200,000+ students use the site each month, and all videos are licensed under CC BY-NC-SA, with some already translated into Spanish, Arabic, Mandarin, Hindi, and more.
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