He had said, “This guy is amazing. It is awesome how much he has done with very little in the way of resources. Gates and his 11-year-old son, Rory, began watching videos, from algebra to biology.

Hailing from Bangladesh, Salman Khan lives in an undistinguished farm house off the main freeway of Silicon Valley, in a converted walk-in closet filled with a few hundred dollars' worth of video equipment and bookshelves. He produces online lessons on math, science, and a range of other subjects that have made him a web sensation and his site the most popular educational site on the web.

Today Khan Academy playlist has a total of 1,630 tutorials and are now seen an average of 70,000 times everyday generating 18 million page views worldwide. The free tutorials are voiced by Salman Khan himself without appearing in any. You can only see his explanations and diagrams on an electronic blackboard.