Mid-Autumn Festival, I wish you all a happy festival.

For three days in a row, I visited my former friends and talked about goodbyes, and one of the topics that also attracted attention was, "Luli, what are you going to do next?" ”

To be honest, Lu Li can't say well, although it is decent and honorable to go to work in a factory, but it is not what he thinks in his heart, let alone enter any government unit, such as a police station, to be one of the eight members; There was no hope of joining the army, he was past that age. In addition, in his heart, he really wants to take a different path, as he said to Yu Fang, do it yourself!

"Xiaoxiao, didn't Uncle say you, do it yourself, what are you doing? What kind of craft do you have? Don't say it, you'll be a carpenter, so you learned it from your uncle, right? When he was drinking with Xu's father once, the other party commented on him, "How much money can you have when you make furniture for someone?" Besides, what about labor insurance, what about your medical care, and what about food relations, all throw them on the streets, and recognize them as unemployed youths? ”

Naturally, Luley thought about these questions, but the strange knowledge that came from his mind had all been confirmed by the passage of time -- that was the basis for Luli to dare to make such a decision -- that the country wanted to develop its economy and change the old concept of 'class struggle as the key link', and his own approach may not be recognized now, but what about in the future? Doesn't the state also say, 'Practice is the only criterion for testing truth'? Can't you give it a try if you want to?

This time, in addition to seeing the old man, another purpose was to pull Xu Yunjian to join in, but the current conversation, this topic should not be mentioned! He doesn't even agree with himself, so how can he talk about his son?

In fact, not only Xu's father, but his idea of going out and working alone was opposed by almost everyone without exception, whether it was Cao Xun, Zhang Qing, Zhang Hao, Yu Fang, Xu Yunjian, Brother Lai, Brother Zhao and other friends, classmates and relatives in the city, as well as Liang Xin and Zhao Min, who were studying in college, the two of them were shocked to learn of this and wrote to him in person, asking him to consider this decision 'seriously, seriously, and more importantly, prudently'.

Self-employed was a term almost equivalent to 'three indiscriminate' in the era at that time, and those who took this step were spurned by all the people in society! It's a complete disagreement, and it's definitely not something you can get rid of by making more money - in fact, it wasn't until the late 80s that this old idea was reversed!

In the face of so many people's opposition, Lu Li was really a little panicked, could it be that so many people are wrong, and you are right? There is no such truth in the world! After thinking about it, he couldn't figure it out, and suddenly he remembered someone. Ride a bicycle and go straight to the No. 1 Middle School of Tian (Tianjin) City. When I entered the school and found the junior high school group, Yang Shiguang was not in the office, asked her colleagues, and replied, "It's in class." ”

Looking at the time, not long after the second class in the morning started, Lu Li walked out of the office, walked around the corridor, and soon saw Yang Shiguang, who was teaching a class in the second year of junior high school. After Yang Shiguang returned from the United States, she worked in a middle school in Tian (Tianjin) City, 53-55 years, she served as a physics teacher in the school, one of them named Hua Liang, more than 20 years later became the vice principal of a middle school in charge of teaching. So I visited the door several times, and finally invited the teacher over.

Hua Liang did this, firstly, because he sympathized with the teacher's experience over the years, and secondly, he had deep confidence in the teacher's teaching ability - a teacher, of course, must have knowledge, but the amount of accumulated knowledge has nothing to do with teaching ability! It is a technology, or even a science, for a person to impart the knowledge he has mastered to everyone in a way that children can understand and are willing to accept! And Yang Shiguang is undoubtedly the best among them.

In her class, she will never be entangled in the content of books and lesson plans, let alone add class hours in order to complete the teaching work, but uses a very relaxed and enjoyable teaching method, so that the teaching of each class can let the children fully grasp the content of the class! Hua Liang knew about this for a long time, so he insisted on inviting her over despite the principal's objections.

This was the case for today's class, she prepared a few teaching props, some of which she borrowed from the chemistry group, test tubes, test tube racks, alcohol lamps, water and wooden stoppers, and a small packet of magnesium powder. "Students, let's ......" Yang Shiguang frowned slightly, she had a little discomfort in her stomach today, and she spoke slowly, "Let's do an experiment." ”

Take the test tube, put in a little water, plug a small cork, install it on the test tube rack, light the alcohol lamp below, after a while, the water begins to boil, and the test tube is covered with a layer of water vapor, and when the water vapor is gradually saturated, the test tube is transparent again, and then 'bang!' With a bang, the cork popped out!

"Students, this is the principle of rockets. The combustion of combustible objects is used to expand the air and push the ......"

"Teacher, if you're not feeling well, we can study on your own."

Yang Shiguang looked at his watch, there was still a while before class ended, and if he endured it any longer, he was afraid that he would make a fool of himself in public! In a blink of an eye, she saw a person standing at the window, she thought it was another teacher, opened the door and looked, and immediately smiled, "Luli? How did you...... Here it comes? ”

"I'm coming here to see you, by the way...... Something, I would like to ask your opinion......

"Okay, okay." Yang Shiguang nodded frequently, called Lu Li to the door, and whispered a few words to him, Lu Li smiled, "Okay, no problem." ”

The two of them entered the classroom together, Yang Shiguang pointed to the classmates and made a brief introduction, "Students, this is Lu Li, and he is also the teacher's student back then, don't look at him a few years older than you, but he is an old party member with four or five years of party experience!" If you have anything to say, ask him. Teacher...... Get out first. ”

Yang Shiguang hurriedly ran away, leaving Lu Li alone in the class, facing the thirty or fifty young children, he blushed a little, "...... I, I'm a little stammering, slow talking, you guys try to ...... Don't ask questions, study on your own, right? ”

The children looked at each other, strange and funny, why did he talk like that? Don't let us ask, just ask, embarrassed for you! "Brother Lu, are you really a party member? When did you join the party? ”

Luli didn't want his words to be counterproductive, these kids were so annoying! Didn't you ask about it? Why do you still ask? "I'm real, it's been 75 years since I joined the party."

With the first person, the people behind him began to be enthusiastic, and he was really overwhelmed by the questions asked one by one, "Brother Lu, I want to ask you, what is the use of this mathematics, physics and chemistry?" I don't like it at all, I can't learn it, is there anything you can do? ”

When he was in middle school, although there were courses in mathematics, physics and chemistry, he did not give a very in-depth explanation, because it was only a "science and technology" thing, and all the syllabus that prioritized politics did not match, so the teacher did not dare to teach seriously, and the children would not work hard to learn, speaking of such a course, Lu Li was very ashamed!

He thought for a while, and a sentence suddenly popped out of his mind, slowly walked up to the podium, and said slowly: "I may not be able to help you if I can't learn, learning this kind of thing itself is hard, and if you want to get it for nothing, there is no such reason in the world." But what is the use of what you say, I think, I can give you an answer. ”

He picked up a piece of chalk, drew a circle on the blackboard, drew a straight line in the circle, and then wrote a letter 'π' next to it, "Do you know this?" ”

"Yes, π! It is used when finding the area of a circle. A girl replied loudly on behalf of everyone.

"Well, the official name is the ratio of the circumference of a circle to its diameter. Its value is known to all of you, 3.1415926 ......, and when used, only two decimal places are taken. Isn't it? ”

"Yes."

Luley nodded, "But there is one thing you don't know, after the decimal point, there is no sign of repetition until now, that is, the row of numbers after the decimal point will go on endlessly, forever!" ”

This knowledge was unheard of by the children, and Luley's words immediately caught their attention, "Forever? ”

"Yes, forever. China is an ancient civilization with a history of 5,000 years, but if you can list all the things that have happened in the past 5,000 years related to numbers, you can find the corresponding ones in the value of 'π'. And that's not all, it's the same for you, the date of your birth, the weight you weighed when you were born, the time you cried for the first time, the time you went home, the time you took your first sip of milk, the first dream you had, the first time you opened your eyes, your first smile, everything, everything related to numbers, you can find the corresponding numbers in the 'π'. ”

"That's not all, if there is a technology that can convert all the numbers into letters, including the letters of Hanyu Pinyin, π contains the whole story from your birth to your death! Your studies, your future work, your life, even your children, your children's children, all the stories are contained in this small, simple circle. ”

Lu Li's long narration undoubtedly has a deafening effect on these children who are in the process of infinite intellectual curiosity!

The sound of footsteps sounded on the porch, and everyone turned their heads to see that it was Yang Shiguang who was back, he smiled and looked at the teacher who had walked back to the door of the classroom, "As for how to tell your own story and draw your own circle, it depends on you." ”