Khan’s videos are short – 7 to 15 minutes long.          

He does not appear in any of his videos; only his voice explains what he’s writing on the virtual blackboard. The videos cover topics from Mathematics, History, Healthcare & Medicine, Finance, Physics, Chemistry, Biology, Astronomy, Economics, Cosmology and Computer Science. You can find videos appropriate for sixth grade through college level learning.

Read more at http://askbobrankin.com/how_to_learn_almost_anything_for_free.html

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