This guy is hands down the clearest and most hilarious math instructor I have ever had.
And to think this guy has delivered 141,362,837 lessons, for free?
Man.
I have yet to listen to the pleas of any Wikipedia Founder/Writer/Editor/Marketing Specialist/Janitor to donate to Wikipedia, but Sal Khan has sure got my vote.

That's right, all 5 dollars of it.
...maybe more in the future.
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