1．The Bangladeshi-American，Salman Khan was born in 1976to a poor immigrant family．He knew clearly（33）that/how education could give people power and change their lives for the better：Khan went to a public high school （34）where"a few classmates were fresh out of jail"，as he told The New York Times，but he got into the Massachusetts Institute of Technology．
He got Bachelor of Science degrees in mathematics，electrical engineering and computer science，and also got a Master of Business Administration degree from Harvard Business School．Khan then worked as a successful hedge-fund analyst （對(duì)沖基金分析師）．
It all began in 2004（35）when Khan began tutoring his cousins who were having difficulty with math．To make it easier to communicate with them，he decided to put the lessons online as a series of videos．His cousins quickly found that they preferred seeing Khan online．
"（36）Having （have） a video lesson that they could pause and repeat made it easier to learn"commented Wired magazine．without tiring their tutor．
He started to realize that the videos could help a lot more people and never grow old．He then quit his job，made more than 4，800videos teaching math of all grades，put them online，and started Khan Academy in 2006．
"My ideas about teaching were straightforward and deeply personal．I wanted to teach in the way I wished that I（37）had been taught（teach）．I hoped to show the joy of learning，the excitement of understanding things about the universe．I wanted to pass along to students not only the logic but the beauty of math and science，"he wrote in his book The One World Schoolhouse：Education Reimagined．
The academy has become so popular across the world（38）that celebrities and businesspeople are starting to offer donations，including Microsoft founder Bill Gates．He has donated more than 9million （about 57million yuan） to the academy organization，reported Forbes．
However，Khan doesn't want to make money from it．"My goal is to make learning faster for students of all ages．（39）With so little effort on my own part，I can give a large number of people power for all time．I can't think of a（40）better （good） use of my time，"Khan said in his TED talk．
