On his educational website, "Khan Academy," Sal Khan teaches millions of students across the world each month. His teaching method has become so effective that he may be the future of American ... more 
On his educational website, "Khan Academy," Sal Khan teaches millions of students across the world each month. His teaching method has become so effective that he may be the future of American education. Dr. Sanjay Gupta reports on Sunday, Sept. 1 at 7 p.m. ET/PT. less 
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