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Over the last four years, the Khan Academy, a one-man nonprofit organization, has created approximately 1,200 video lessons on YouTube . From basic arithmetic to college level math and physics, the Khan Academy creates short, encapsulated lessons one at a time, all that is required is computer and internet access.

Salman Khan, founder of the Khan Academy, notes that he has reached far more students than he ever imagined, including students from the Middle East, Ethiopia, Uganda, and Latin America. His video lessons reach 100,000 students a month, and are viewed 40,000 times a day.

Student response has been positive: One student notes that not all teachers can accommodate a pace that is "perfect for everyone." The videos act as a great supplement to classroom learning and offer students the ability to gain a "deeper understanding" as they can watch them on-demand, and work through the lesson at their own pace, for free!

The Khan Academy won the 2009 Microsoft Education Tech Award and has been featured on PBS NewsHour and NPR's All Things Considered. Salman Khan hopes to expand his lessons to history, grammar, and whatever else strikes his fancy.