When Gauss was at the University of G? ttingen, he was late for something once, and almost all the classes were over when he got to the classroom. Gauss walked into the classroom and found that the teacher was not there. He wrote several questions on the blackboard. Gauss thought these questions were today's homework, so he wrote them down. That night, he spent the whole night studying these math problems. Unexpectedly, these problems are extremely difficult. Gauss didn't solve a problem until dawn. The next day, he found the teacher in frustration and told him all about it. His teacher was shocked: "These are the most famous problems in the history of mathematics, and you actually solved one in one night?" The problem solved by Gauss is the problem of drawing a regular heptagon ruler that has puzzled mathematicians for two thousand years. That year, Gauss was only 19 years old!

Jingrun Chen

Chen Jingrun is a famous mathematician in China. He doesn't like going to the park and walking, but studying. When he studies, he often forgets to eat and sleep. One day, when Chen Jingrun was having lunch, he touched his head and found that his hair was too long. He should get a haircut quickly, otherwise people will think he is a big girl when they see him. So he left work and ran to the barber shop.

There are so many people in the barber shop that everyone cuts their hair next to each other. Chen Jingrun got brand number 38. He thought, it's still early for me to turn around. Time is so precious that I can't waste it. He hurried out of the barber shop, found a quiet place to sit down, then took out a small notebook from his pocket and recited new words in a foreign language. He recited it for a while and suddenly remembered that when he was reading a foreign language in the morning, there was one place he didn't understand. You must understand what you don't understand. This is Chen Jingrun's temper. He looked at his watch. It's only half past twelve. He thought: check in the library first, and then come back for a haircut. He stood up and left. Who knows, not long after he left, it was his turn to get a haircut. The barber shouted, "Number 38! Who is number thirty-eight? Come and get a haircut! " Think about it. Chen Jingrun is reading in the library. Can he hear the barber calling number 38?