Lin Zhixia's ninth birthday is September 24, 2004.

Jiang Yubai remembered this date firmly.

Previously, Jiang Yubai already had a new tutor - this teacher graduated from the best university in the province. This university is ranked among the top five in the country, and its School of Mathematical Sciences is ranked among the top three in the country.

Jiang Yubai asked the new teacher: "Have you studied physics?"

The teacher pushed up the glasses on the bridge of his nose: "I was in a competitive class in high school. I participated in math and physics competitions."

"Very good," Jiang Yubai nodded in approval, "Please recommend to me the most difficult exercise book for the physics competition. It must be the most difficult, the latest one, not the normal difficulty."

The teacher questioned: "High school competition level? I'm afraid you can't read it... What did you buy it for?"

Jiang Yubai held the pen and tapped on the page: "I need a copy of the latest and most difficult physics competition exercise book in history." He deliberately imitated his father's tone: "I'm sorry, it involves personal privacy.

, I cannot answer your question in detail."

The teacher was full of confusion. But after all, he was a professional mathematics tutor. Soon, he recommended the "International Young Physicists Competition", "Princeton University Physics Competition", and "British Physics Challenge" to Jiang Yubai.

Competition", "Canada's Waterloo Newton Physics Competition" and "China Physics Olympiad" and a series of excellent physics exercise books.

These names sound very difficult! Jiang Yubai cheered up and wrote hard.

He looked at the list of books he had listed, and had a premonition that Lin Zhixia would burst into tears and quit.

On September 24, 2004, Jiang Yubai was carrying a schoolbag and picked up a heavy handbag.

He successfully collected a summary of all the exercises - both in Chinese and English. Moreover, Jiang Yubai also spent a whole night tearing up the answers to all the books.

Yes, he tore up the answer.

He knew that this was an immoral, dishonorable and dishonest act. His conscience was being tortured.

In the end, his desire to win slightly gained the upper hand.

At 7:17 in the morning on September 24, Jiang Yubai slowly walked into the classroom of Class 1, Grade 4, carrying a heavy bag. His expression looked the same as usual. But something was already welling up in his heart.

A huge wave has arisen, and it is surging and turning the river upside down.

He guessed that Lin Zhixia might cry.

His movements in placing the exercise books became hesitant.

What should he do if she cries?

He should not make his deskmate cry, let alone be too cruel. He should be a good person and become a good man when he grows up.

Jiang Yubai glanced sideways at Lin Zhixia.

Lin Zhixia's cheeks were white and rosy, and the clear morning light made her eyes have stars. She opened her notebook and was writing "Human Observation Diary".

Lin Zhixia wrote: On September 24, 2004, today I will continue to accumulate materials. My deskmate Jiang Yubai is still studying complex number theory recently. He does not really understand the meaning of vectors in complex number space. He may

It will take some time before mathematical tools can be applied to practical theory. Yesterday I described my understanding of superstring theory to Jiang Yubai, and I found that Jiang Yubai also knew nothing about the famous general theory of relativity...

The four big words "know nothing" stung Jiang Yubai's eyes.

Put away your pity. Jiang Yubai warned himself. Pity for the enemy is cruelty to yourself.

He clenched his fists, made up his mind, and shouted in a voice as cold as hell: "Lin Zhixia."

Lin Zhixia wrote quickly and with great energy. She asked casually: "What's wrong?"

Jiang Yubai emptied his handbag on the table.

"Chinese Physics Olympiad", "International Young Physicists Competition", "Princeton University Physics Competition", "British Physics Challenge" and other most difficult international physics competition topics in history are all presented in this moment.

In Lin Zhixia's eyes.

"I'll give it all to you," Jiang Yubai said slowly and like a devil, "I tore up all the answers."

Lin Zhixia raised her head and stared into his eyes.

He added: "I tore every copy, tore them cleanly."

Just as Jiang Yubai expected, Lin Zhixia's eyes were filled with mist, and tears accumulated, filling her eyes.

The roots of her ears also began to turn red, like the sunset at dusk in midsummer. She even trembled slightly, as if she had turned into a fish caught by someone by the lake. Her nose was sore, and she couldn't help crying, and the more she cried, the more

She couldn't stop. Her beautiful eyes were covered with tears, and she secretly complained to him in a pitiful tone: "I know I shouldn't cry, but, but, some emotions are uncontrollable... Last week, you asked me about my birthday.

On that day, I thought about whether you were going to give me a gift... It was the first time I received a birthday gift from a classmate... I had never... no one treated me like this..."

Jiang Yubai didn't expect her reaction to be so big.

He has lost the joy of winning.

He stammered: "Yes, I'm sorry, Lin Zhixia, I didn't throw away the answer. I will... this afternoon..."

I will definitely bring you all the answers in the afternoon.

Before these words were spoken, Lin Zhixia wiped away her tears and said to him: "Thank you, thank you! This is the best birthday gift I have ever received! Jiang Yubai, you are my best friend!"

You will always be my best friend! Jiang Yubai! You are so kind!"

Jiang Yubai was a little confused.

Lin Zhixia was so happy that she even held his wrist: "I never look at the answers... I don't like looking at the answers. I hate the answers because the ideas in those answers are completely different from mine. I just need to find the problem.

, questions can help me think, and the thinking process is the most critical. You understand me well, you understand me really well. Thank you for tearing up all the answers for me! Thank you, Jiang Yubai."

Jiang Yubai withdrew his hand. He looked at the table of the desk quietly and finally understood that Lin Zhixia was crying with joy just now.

Lin Zhixia's eye circles were red, like a little rabbit. She was still chattering: "There is no answer, and the book has become lighter. I am so happy! Today I will continue to teach you about superstring theory! Yesterday we talked about superstring theory

Fusion of general relativity and quantum mechanics! Do you know 'tachyon'? 'Tachyon' refers to a subatomic particle that exists in theoretical physics and moves faster than the speed of light. It will never slow down to a speed close to the speed of light...

...The supersymmetry of superstring theory refers to the symmetry between fermions and bosons. Isn’t it so interesting! Can you imagine the connection between supersymmetry and tachyons..."

Jiang Yubai grabbed the handbag and stuffed it into Lin Zhixia's drawer. He said, "It's for you to put your books in."

Lin Zhixia nodded: "Okay."

Jiang Yubai put his chin on one hand and murmured to himself: "I will not lose."

Lin Zhixia was confused: "What to lose?"

Jiang Yubai kept it secret. He would not let Lin Zhixia realize that this was a competitive crisis prematurely.

Lin Zhixia's face was still wet with tears. She took out a napkin and wiped her face. She sat in the corner of the last row, and none of the classmates in the front row noticed her violent mood swings. After a while, Lin Zhixia seemed to have regained her composure.

, Jiang Yubai looked at the world outside the window and changed the subject: "A plane flew in the sky."

Lin Zhixia said: "I have never flown on a plane."

Jiang Yubai was surprised: "Really?"

"What's it like to fly?" Lin Zhixia asked him.

At this time, squad leader Dong Sunqi, who also serves as the "mathematics class representative", was collecting homework.

Dong Sunqi stood next to Jiang Yubai and issued important instructions to each group: "Those who have not handed in their homework! Remember their names! No discussion!"

Later, Dong Sunqi answered Lin Zhixia's question: "Before taking the plane, you have to buy a ticket first. After entering the airport, you have to choose your seat at the check-in counter..."

Jiang Yubai interrupted Dong Sunqi: "You don't need to buy a ticket for a private plane."

Dong Sunqi held a stack of math homework books and looked at Jiang Yubai condescendingly: "Do you have a private jet at home?"

Jiang Yubai answered humbly and low-key: "I didn't buy it."

"Nonsense," Dong Sunqi questioned, "How could you possibly buy a plane?"

Jiang Yubai was inspired by him to be competitive: "When I grow up, I will definitely buy it myself."

Dong Sunqi immediately compared with others and said: "I will buy it too! I will buy a cross!"

Zhou Bufeng, who was sitting in the front row, joined in the comparison: "I want twenty Boeing 747s."

Dong Sunqi put down his math homework and devoted himself to the battle: "I want to buy thirty domestic J-8 fighter jets and thirty American-made Lightning fighter jets! I also want an aircraft carrier, a guided missile destroyer, an intercontinental aircraft..."

"Why do you want these things?" Jiang Yubai asked him.

Dong Sunqi was stunned on the spot, unable to explain why.

Jiang Yubai mocked coldly: "Do you think you are playing Age of Empires?"

"Age of Empires" is a computer game popular among boys in the school. Players accumulate gold, food, wood, population and other resources, produce armies and military weapons, and fight against the enemy in order to achieve final victory.

Dong Sunqi was choked by Jiang Yubai's words. He walked to the side and began to urge everyone to hand in their homework.

When collecting homework, Dong Sunqi's brain did not stop working. He finally came up with a way. So he ran back to Jiang Yubai and solemnly declared: "Jiang Yubai, will you come to my house to play on the weekend? I have a computer at home.

! It contains "Age of Empires". I also have a DVD player at home, and the complete discs of "Slam Dunk", "Inuyasha", "Pokémon", and "Detective Conan", have you seen them?"

"I've watched "Inuyasha", "Pokémon" and "Detective Conan"!" Lin Zhixia slapped the table and responded in surprise.

Jiang Yubai thought that Lin Zhixia was going to Dong Sunqi's house as a guest. He immediately turned his head and looked at Lin Zhixia: "I also have animation discs at home, so come to my house."

Lin Zhixia was startled.

Jiang Yubai said: "I have everything at home."

In fact, Jiang Yubai's driver, Manor, and Aston Martin were all famous throughout the grade.
To be continued...