I like it. I don't use it much, but I think services like that in general are awesome--definitely a step in the right direction. The internet is an awesome platform for education, but distributing education over the internet is still in its early days.
Textbooks are better. Lectures on khan academy are an inefficiant use of your time because he literally takes 10 minutes to explain shit that can be read off a textbook page in 1 minute and the rest of the 9 minutes can be spent practising.
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