Thoughts on Khan Academy?

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Although I did receive my education in the traditional way of educational institutions, I do appreciate Khan Academy. If it were not for Sal Khan, the founder of Khan Academy, I would have to refresh my knowledge and skills on math and science by skimming through numerous textbooks. I love the model of online free education from his site; his online video lessons enable the viewers to learn the fundamentals or refresh their memories on various subjects. To all myLotters, what are your thoughts on Khan Academy?