Top student: All my teachers are academic whizzes!

"Then let me ask you, how is our country developing now?"

At his desk, Han Chuan stared at the words in front of him, his fingertips unconsciously stroking the yellowed pages of his textbook.

The words were written with exceptional lightness, the broken strokes conveying a sense of caution and trepidation, like someone who has been away from home for too long meeting an acquaintance from the village, wanting to ask, "How is everything at home?" but also afraid of hearing an unpleasant answer.

He suddenly understood the old man's feelings—in 1952, China had just emerged from the flames of war, its landscape scarred and in dire need of reconstruction.

At that time, Mr. Zhou should have been in Tsinghua University, teaching his students to do calculations with an abacus and compiling mechanics textbooks under conditions where there wasn't even a proper wind tunnel.

In his eyes, China is a country that has just taken its first step.

He wanted to know where his homeland had gone 57 years later.

"Old Zhou, I'll tell you some crucial information, and you'll understand."

Han Chuan pondered for a moment before speaking. After thinking for a while, he sat up straight and decided to tell this old gentleman, who had transcended time and space, about some key matters.

"You speak, I'm listening."

Zhou Peiyuan's handwriting immediately popped up on the textbook of "Theoretical Mechanics," his strokes conveying an eagerness.

Han Chuan thought for a moment and decided to start from the distant past and work his way up: "Your book, Theoretical Mechanics, was published in 1952. I'll start talking to you from 1953."

On the textbook, the handwriting flickered, as if nodding, then hung quietly on the page, like an old man sitting down on the pages, ready to listen to a long story.

Han Chuan organized his thoughts and began, "In 1953, the first Five-Year Plan for 'Systematic Construction of Socialism' was launched. We built the First Automobile Works in Changchun and produced the first batch of Jiefang brand trucks. From then on, we were able to manufacture cars ourselves."

On the textbook of "Theoretical Mechanics", the handwriting brightened slightly, and a hint of satisfaction was revealed in the strokes.

"Great! With cars, the country can move! With industry, the country can truly stand up!"

Han Chuan nodded, his eyes full of agreement, and continued, "You're right, industry is the backbone of a nation."

"Following this, in 1956, Shenyang Aircraft Industry Group, also known as Shenyang Aircraft Corporation, produced our country's first jet fighter - the J-5, which successfully completed its test flight."

"In 1960, our first rocket to explore outer space was launched!"

"On October 16, 1964, the first atomic bomb, codenamed 596, was successfully detonated in Lop Nur. A mushroom cloud rose into the sky, turning the entire sky red. We now possessed our own nuclear weapons!"

Upon hearing this, the handwriting on the "Theoretical Mechanics" textbook trembled violently.

"An atomic bomb? We made it ourselves?!"

"right!"

Han Chuan grinned and said, "That's right! We built it entirely ourselves!"

"Back then, the Soviet Union in the north withdrew its experts and burned the blueprints before leaving, trying to strangle our nuclear industry in its cradle. But our researchers built it up from scratch!"

"Then, less than three years later, on June 17, 1967, we detonated our first hydrogen bomb."

Zhou Peiyuan: "Excellent! Excellent! With nuclear and hydrogen bombs, we can finally stand firm on the international stage!"

Han Chuan smiled and nodded, then continued, "In 1970, the Dongfanghong-1 satellite was launched. We became the fifth country in the world to independently launch a satellite."

"In 1971, we regained our legitimate seat in the United Nations."

"In 1973, Mr. Yuan Longping's research on hybrid rice was successful—indica hybrid rice, with a yield per mu that was much higher than that of traditional rice."

"Ten years later, in 1983, our grain output exceeded 10 million tons, with a per capita share of 800 jin (4 catties), basically solving the problem of food and clothing. Since then, our country has been able to gradually achieve self-sufficiency in grain production and is no longer oppressed by famine."

Upon hearing this, the words on the textbook seemed to leap with excitement once more, and Zhou Peiyuan spoke with heartfelt satisfaction.

"This is good!"

"Having enough to eat and not going hungry is the most important thing!"

Han Chuan smiled and continued, "In 1997, Hong Kong officially returned to China."

Upon hearing this, the handwriting, which had been quietly suspended on the paper as if slowly processing this information, suddenly twitched.

A new line of text appeared: "Hong Kong, has it been taken back?"

"It's back!"

Han Chuan gave a strong "hmm" and laughed, "In 1999, Macau also returned."

The silver light on the pages shimmered gently, like an old man letting out a long sigh.

Han Chuan continued, "In 2001, we officially joined the World Trade Organization (WTO) and deeply integrated into the global economic system. In the same year, Beijing won the bid to host the 2008 Olympic Games."

"With the launch of Shenzhou V in 2003, we became the third country in the world to independently send humans into space."

"In 2006, the Qinghai-Tibet Railway officially opened to traffic, running directly from Xining to LS. It is more than 1,100 kilometers long, with more than 500 kilometers laid on permafrost. It is the highest-altitude railway in the world."

Upon hearing this, the words suddenly popped out: "Building a railway on the Qinghai-Tibet Plateau? I took my students to the southwest several times back then, and looking at those Hengduan Mountains, I thought, when will there be a road to cross over them?"

"Back then, even building roads in the Hengduan Mountains was difficult, yet you managed to build a railway on the Qinghai-Tibet Plateau?"

Han Chuan nodded and said with a smile, "That's right. Back then, the experts from Hongsu said it couldn't be repaired. They said the permafrost on the Qinghai-Tibet Plateau would thaw in the summer and the roadbed would collapse."

"But our engineers developed their own ventilated roadbed technology and managed to build it!"

At this point, Han Chuan seemed to remember something and added, "Oh, right, there's another important event."

"In 1991, our big brother in the north disintegrated."

"???"

Three question marks popped up in surprise on the textbook of Theoretical Mechanics.

"Big Brother, it's disintegrated??"

For Zhou Peiyuan, after the founding of Big Brother in 1922, it played a pivotal role on the world stage.

Around 1953, the relationship between the Big Brother and them was very good. The Big Brother was a true Big Brother, and the 156 key industrial aid projects played a crucial role in their industrialization process.

He was indeed quite surprised to hear the news of the dissolution of Hongsu.

Han Chuan nodded and said, "From 1958 to 1978, over these twenty years, relations between the two countries deteriorated due to issues such as territory and competition."

"The withdrawal of experts, the cessation of aid, and large-scale public discussions about the imminent outbreak of war all occurred at this time."

"Especially during the decade from 1969 to 1978, a million troops were stationed on both sides, and war could break out at any moment."

Upon hearing this, Zhou Peiyuan asked in surprise, "How did it come to this?"

Han Chuan shrugged and said, "The reasons are complicated, but the core issue is a conflict of national interests; the other side is trying to [illegible]."

(***This is a question from the college entrance exam. I couldn't write the sensitive content because I tried many times. Anyway, I'll leave it to everyone to comment on.)

"However, after 1989, with the gradual strengthening of our motherland, relations between the two countries gradually warmed up and returned to normal."

On the textbook, Mr. Zhou's handwriting flickered slightly.

The fact that the country, once hailed as the leader of the camp, was gone did indeed leave him with some regret.

After a pause, new handwriting reappeared.

"Xiao Han, continue, what happened next?"

Han Chuan nodded and continued, "Last year, in 2008, the Shenzhou VII manned rocket was successfully launched, and our astronaut Zhai Zhigang completed the first spacewalk by a Chinese person."

"He was wearing a spacesuit that we made ourselves, and he flew in outer space for almost 20 minutes outside Shenzhou VII, holding the five-star red flag in his hand."

Upon hearing this, the writing paused abruptly, and the silver light suspended on the paper trembled gently, like a pool of spring water ruffled by the wind.

"Spacewalk?"

"A spacesuit you made yourself?"

Han Chuan smiled and nodded, but what he didn't say was that five years later, Chang'e-5 achieved a lunar landing.

After all, that's something that hasn't happened yet, so it's inappropriate for him to say it.

But just what has already happened is enough to keep Mr. Zhou busy for a while.

He waited a moment until the words on the pages stopped trembling before continuing to speak.

"Mr. Zhou, let me tell you something else."

The handwriting shifted, as if snapping out of a thousand thoughts: "You speak."

Han Chuan: "Now that we've discussed military and technological development, let me add a bit about our country's economic development."

He paused for a moment, then smiled and continued, "Back in 1952, the country's GDP was about 60 billion RMB."

"And last year, in 2008, guess what our GDP was?"

Upon hearing this question, Zhou Peiyuan hesitated for a moment, and a number appeared in his textbook on theoretical mechanics.

"One trillion?"

For him, this was already a very bold speculation.

After all, in 53, the motherland was really poor and backward, and the annual GDP was only a few tens of billions. In 50 years, it would be quite good if it could grow to one trillion a year.

Upon seeing this number, Han Chuan grinned and said, "Old Zhou, you can be a little bolder!"

The handwriting paused slightly, then another number popped up: "Then... three trillion?"

Han Chuan shook his head again and laughed, "Be a little bolder!"

He paused for a moment, then wrote a number with trembling hands: "It can't be ten trillion, can it?"

Han Chuan looked at the line of text, smiled and shook his head, then held up three fingers and gave an answer.

"No!"

"Not three trillion, not ten trillion, but thirty trillion!"

"Last year, in 2008, China's GDP had already exceeded 30 trillion yuan, more than 500 times that of 1952!"

"We are now the world's second-largest economy, and it will only take us two years at most to surpass Japan... the Japanese nation of cherry blossoms who are living a very comfortable life!"

This time, the handwriting on the textbook paused for a long time.

It was only when Han Chuan thought that Mr. Zhou had disappeared that a new line of writing slowly appeared.

"very nice!"

"When I compiled this textbook in 1953, the school had to use sacks to carry the money when paying salaries. At that time, inflation had not been completely controlled, and it cost tens of thousands of dollars to buy a kilogram of rice."

"Back then, we were thinking about whether we could survive, whether we could develop well, and whether we could ensure that everyone in the country had enough to eat and warm clothes to wear. We never imagined that we could develop to the level you have reached."

"At that time, we only had one thought in our minds: if our generation suffers more, the next generation will suffer less. If our generation does more, the next generation will be able to stand taller."

"What you said tonight makes me feel that it was all worth it."

"09 was a great year."

Looking at these words, Han Chuan felt something welling up from the bottom of his heart, and his eyes reddened as he said, "Old Zhou, we'll do even better together in the future!"

"We'll surpass the US sooner or later and become number one in the world!"

"No!"

"It should be said that we've returned to the position that belonged to us for thousands of years!"

The silver light on the pages shone quietly as a new line of text appeared.

"Good! That's ambitious!"

"The future is in our hands!"

After a pause, Mr. Zhou Peiyuan's words resurfaced in the textbook of Theoretical Mechanics.

"Xiao Han, I remember you just said you were still in school?"

Upon hearing this, Han Chuan quickly nodded and said, "Yes, I am a sophomore in high school this year, and I am currently studying mechanics, motion, and energy."

Zhou Peiyuan's words emerged, the strokes warm, and carrying a hint of a smile: "Although fifty years have passed, I don't know how much physics has developed now."

"However, I should still be able to teach you basic physics concepts such as mechanics, motion, and energy."

The writing paused for a moment, then a new line was added.

"Of course, if you don't mind this old man."

Upon hearing this, Han Chuan quickly shook his head and said, "How could that be? You are the founder of modern mechanics and theoretical physics in our country."

"Having you as a teacher is something countless people would kill for!"

Zhou Peiyuan chuckled and wrote in his own handwriting, "Okay, as long as you don't mind."

Han Chuan quickly pushed the test paper forward and said, "Thank you, Professor Zhou. I don't quite understand the elastic potential energy and maximum compression of the spring in this mechanics analysis question."

Zhou Peiyuan: "Let me see."

The handwriting in the textbook shifted slightly. After glancing at the questions on the test paper, a new line of handwriting appeared, smiling gently.

"This question is indeed a bit difficult, but it's okay. Let's take it one step at a time. I'll explain it slowly, and you'll listen carefully. You'll definitely be able to understand it."

"The first question asks us to calculate the magnitude of the velocities of A and B just before their collision. Let's look at the known conditions: the mass of slider A is m = 2 kg, and the mass of slider B is M = 3 kg..."

"A slides down the inclined plane, and the end of the inclined plane smoothly connects to the horizontal plane. B is close to the bottom of the inclined plane, so A does not slide on the horizontal plane, and its speed is v0. Then substitute it into the calculation..."

As Mr. Zhou Peiyuan explained, the sky outside the window gradually darkened, and the entire self-built house gradually sank into the silence of the spring night, with only the lights on the second floor illuminating the room.

Here are unfolded physics exam papers, scratch paper filled with calculations, a yellowed, traditional Chinese-language, vertically formatted copy of "Theoretical Mechanics" published in 1952, and two people from different eras, one old and one young, quietly explaining and learning.

.....

P.S.: Requesting monthly votes, recommendation votes, and comments!