He has millions of students from all around t he world. They listen to his classes online but never see his face on the screen. Salman Khan , 39, from the US, is the founder of the learning website Khan Academy. Unlike other online courses that film teachers giving classes, Khan's videos only use hi s voice and a digital ( 数码的 ) blackboard for writing. He says he doesn't want a human face to distract _ students. Khan also makes his classes as short as 10 to 15 minutes so students don't lose interest. They can also earn ( 获得 ) points from taking these classes. These kinds of special courses make Khan Academy one of the world's most popular online education websites. The courses are translated into more than 36 different languages including Chinese. About 8 0 teachers from the world's top universities are now also teaching on the website. But all this started nine years ago with just one man - Salman Khan. In 2006, Khan made homemade videos to help his seventh grade cousin with math. He posted the video s online and got thousands of views. This encouraged Khan to make more videos and create his own website Khan Academy. As a Bangladeshi - American ( 孟加拉美国人 ), Khan understands that many kids, especially those in developing countries, cannot ge t a good education. He himself has three degrees from Massachusetts Institute of Technology and one from Harvard. He wants to use his knowledge to help more people. Thus, his courses are all offered for free. “ Our mission is to provide a free, world - class education for anyone, anywhere, ” he said. Khan's website has not only become very popular worldwide but has also won a lot of respect. Even Bill Gates, the founder of Microsoft, is one of his fans. Gates donated over $1.5 million (9.6 million yuan) to support Khan and named him the “teacher to the world”. (323 words)