Zhihu, a free math website mentioned in the answer.

The young man's name is salman khan, and he is 39 years old. He subverted American education and became the godfather of mathematics.

Baidu: Khan Academy, the first one is www.khanacademy.org.

It is an immigrant from Bangladesh to the United States. But he is a genius. He was admitted to the Massachusetts Institute of Technology through his own efforts, finished mathematics and computer science in four years, got two undergraduate degrees, and later got a master's degree from Harvard University.

Salman khan has a little niece named Nadia. In 2004, she was in the seventh grade in New Orleans, and her math performance has been very poor. She asked Khan to help her. For Khan, who was 28 years old at that time, mathematics was his strong point, and one of his majors at MIT was mathematics.

Khan and Nadia are not in the same city. Khan taught Nadia to learn mathematics through the Internet, which was lively and interesting, and the concept was clear. Nadia has made rapid progress in math.

Soon, his friends knew about it and asked Khan to help the children with their math. After Khan's tutoring, the children's math scores soared.

Khan thinks this kind of counseling is too inefficient, so it is better to make a video and put it online for everyone to watch for free. As a result, when he got home, he hid in the cloakroom, locked himself up and began to record with his camera.

His video is very vivid, and he can finish a mathematical concept in ten minutes, which has attracted great attention on the Internet. As a result, he locked himself in the cloakroom and recorded videos for a year, from elementary school mathematics to calculus in high school to advanced mathematics in college, all of which were 4,800 videos.

These videos have been a great success on the Internet, with a click rate of nearly 500 million and 48 million people watching them.

Kahan, who is proficient in computers, also designed a software to track the progress of learners and evaluate the learning effect.

Khan is also a computer geek. He wrote a data mining program and established a website called Khan Academy. He put the video on his free website and let the children learn math like playing games.

Khan Academy's monthly visits reach 5 million! In contrast, the MIT OCW website has only 1.5 million monthly visits.

After Khan's video was successful, many venture capital institutions found him, hoping to inject capital to set up a company and charge for the video. Khan can immediately become a 10 dollar rich man!

However, the poor diaosi refused. He would rather be middle class than accept donations from others and never charge. He said: I just want to do free education. Once I charge, won't many children in developing countries look down upon it? I can't imagine any way in my life that is more meaningful than my present life.

For Khan, his life value = the value he created for the society/the income of his life. The greater the proportion, the greater the health value.

In 20 12, Khan successfully appeared on the cover of Forbes magazine. Forbes wrote that this is a business opportunity of 1 trillion dollars. Today, the company with the highest market value is Apple, with only 700 billion dollars.

However, this poor diaosi refused, and he just wanted it for free!

Bill Gates is an avid fan.

Khan has become the darling of American mathematics education and is welcomed by many scientific and technological leaders. They know better than anyone how bad the math education in America is and how important the math level is to the future of America. In the results published by the World Economic Forum 20 1 1, the quality of mathematics and science education in the United States ranks 52nd in the world.

Teaching Video of Chinese Room in Khan College

In 20 13, Khan Academy published Spanish version, followed by Brazilian Portuguese, French and Turkish versions. At present, volunteers from different countries and different language backgrounds have participated in the translation of Khan Academy courses. These online courses are expected to be translated into the following languages:

Chinese, German, Spanish, Czech, Indonesian, Italian, Swahili, Norwegian, Polish, Russian, Turkish, Portuguese, Bulgarian, Greek, Ukrainian, Persian, Arabic and Bengali.