There is a story that I will never forget. A business school in the United States has set up a genius sales award for students. In order to win this award, it is necessary to sell an old axe for chopping wood to the current president of the United States.

This is a very difficult thing. President Clinton has no such hobby. But when President Bush just took office, a student sent him a letter after careful planning, which wrote: "Dear President Bush, congratulations on becoming the new president of the United States. I love you very much, and I love your hometown very much. I have been to your hometown and visited your manor, and the beautiful scenery there left an unforgettable impression on me. But I found a lot of thick dead branches on some trees in the manor. I suggest you cut off these dead branches so as not to affect the beautiful scenery of the manor. All the axes sold in the market now are portable and not suitable for you. I happen to have a big axe handed down from home, which is very suitable for you, and only costs you 15 dollars. I hope I can help you. When Bush saw this letter, he immediately asked his secretary to send 15 dollars to the student. So an almost impossible sales came true, and a genius sales award that had been vacant for many years finally got a winner.