Khan Academy: Free Lectures on Math, Physics, Biology, Economics, and History

It is very rare that I go so far off-topic on my blog, but then again, it is very rare that I find something so cool.  Salman Khan (khanacademy.org) has recorded over 1500 mini-lectures on a wide variety of topics, organized in a cohesive fashion and made available for free on YouTube.  I have already…

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