At the archery range, Ouyang Fei lit the fuse rope on the model cannon.

"Sneer......"

"Tom"

"Pong"

An iron pellet the size of a quail's egg was pushed out by the gunpowder in the barrel of the cannon, and it hit the empty wine jar ten zhang away in front of it, and the wine jar was smashed to pieces.

Ouyang Fei looked at Tang Wuying and said with a smile: "Have you memorized the process of casting the Thunder Cannon, right? ”

Tang Wuying nodded and smiled: "Little brother remembers." ”

"Well, today is in a hurry, I can only test the solid cannonball first, as for the 'flowering shell', that is, the kind of cannonball similar to the 'thunder shock', you can test it again when you have time!"

"I have already told you how to launch the flowering shell, the key is to add a wooden tray in the middle, and use a hollow wooden tube to fill the slow-burning gunpowder as a letter tube, so that the flowering shell will not be in danger of exploding in the barrel. ”

"Solid shells are usually used to attack fortifications, such as destroying enemy fortifications, or bombarding city gates, while flowering shells are usually used to blow up people, and are best used when the enemy is in formation. ”

Ouyang Fei nodded as he said Tang Wuying, carefully writing down every word he said, there were other Tang Sect disciples around to help memorize, even if one person couldn't remember the whole process, it was enough for everyone to remember a little.

On the third day, the last day before Ouyang Fei left, in Ouyang Fei's tent, Tang Wuying said eagerly: "Brother, what are we going to learn today?"

"Today I will not teach you how to make weapons, I will teach you some knowledge about 'physics', once you understand the knowledge of physics, it will be a matter of course to learn the mechanics, you have a pen and paper, and you are ready to record at any time. ”

After Tang Wuying prepared the four treasures of the study, Ouyang Fei went straight to the point, "The so-called physics refers to the basic principle of the operation of all things in heaven and earth, that is, the supreme principle of heaven and earth as you know it......

"To learn physics, first of all, you have to understand the world, to really understand the world, you have to break the inherent cognition, the first cognition you want to break is 'the sky is round and the place is round', yes, the sky is indeed round, but the earth is not square, because the earth is also round......"

Today's Tang Wuying suddenly found that he had never understood the world at all, what "gravitation", "energy and momentum", "gravity", "elasticity", "friction" and so on, made him have a feeling of knowing what it is and why it is.

In the past, many things came from the experience and knowledge that have been passed down from generation to generation, but they only knew what they were, but never knew why they were, just as everyone knew that if you throw something into the sky, it will definitely fall.

But why did it fall? Why didn't it fly into the sky? I'd never thought about it before, and if I were to ask it to someone else, I don't think anyone would be able to answer it.

Because it is their basic understanding that things will fall when they are thrown into the sky, but no one has ever considered why things fall down, and no one can even say the answer to this question.

But after listening to Ouyang Fei's teaching, he had an answer, it turned out that this was the gravity of the earth at work, and it turned out that light work was to fight gravity with internal force, making the gravity of the earth less involved in him.

Tang Wuying suddenly felt that this so-called physical knowledge had opened the door to a new world for him, and this knowledge could not only let him know the world, but also be of great benefit to himself in martial arts.

In the past, they only knew that the flying kite could take off with itself and fly in the sky, but they never thought about why the flying kite could fly with itself, but now that these questions have been answered, he can easily study and make better flying kites.

Tang Wuying was obsessed, he fell in love with "physics", Ouyang Fei's explanation was not from the book, but converted it into a statement that Tang Wuying could understand.

This teaching lasted from 2 o'clock to 3 o'clock, lunch and dinner were sent by the disciples of the Tang Sect, and both of them finished eating as fast as they could, and then continued to start.

Some of the other Tang Sect disciples also listened with relish and gained a lot, while others yawned and didn't know what to say at all, this is the difference between understanding and talent.

It's not that what teachers teach, students can learn the same, so the sentence "others can learn, why can't you learn" that teachers and parents often talk about is completely nonsense.

There are inherent differences between people and individuals, and "why can't you do what others can do" and "I can do it if others" are themselves irrational and irrational.

After a full sixteen hours of explanation and teaching, Ouyang Fei had just finished talking about the "Law of Conservation of Energy", and when he said this, Ouyang Fei temporarily stopped teaching, and the paper in front of Tang Wuying had already recorded a dense large article.

"That's all for today! I'm going to leave Taiyuan City tomorrow morning, you should digest this knowledge I have taught you, and it's best to do experiments to deepen your impression. ”

"I'll be back in three months at the latest, and I'll be back with some things, and you can wait here. ”

Tang Wuying got up, hugged Ouyang Fei deeply, and said, "Thank you brother for your kindness, the younger brother will definitely come here to listen to his brother's teachings." ”

Ouyang Fei smiled and nodded, and said: "Between brothers, don't say thank you, I don't want to accept apprentices, but this skill must be passed on, and this can be regarded as a fertile water that does not flow into the fields of outsiders, hehe." ”

Ouyang Fei said it lightly, but Tang Wuying naturally wouldn't take it seriously, Ouyang Fei's great kindness to him, he would remember it in his heart.

......

In the early morning of the next day, in the south of Taiyuan City, Li Guangbi, Li Chengen, Xiao Qi, Jin Yifang, Su Yunchong, Tang Wuying, Yan Wangqing, Song Senxue, Yan Yimei, Wang Bukong, Feng Yebei, Shen Tuyuan and other people who knew Ouyang Fei came here to see him off, and even Gu Zhilan and Qi Jin, whose injuries had improved slightly, also came.

Ouyang Fei looked at the people who came to see him off, but he didn't expect that he had met so many people in this world?

"Ladies and gentlemen, there is no feast in the world, today's parting is just for the next reunion, the end of the world is not far away, let's see you in the rivers and lakes. ”

Li Chengen said with admiration: "Senior Fang's evaluation of Brother Ou is really right, your perspective on the problem is indeed different, others are 'sorrowful', but when you come here, people are full of expectations." ”

"A good 'the end of the world is not far away, goodbye to the rivers and lakes', Brother Ou's free and easy is exactly what people in my generation can't ask for, sometimes I really envy Brother Ou. Xiao Qi smiled at Ouyang Feidao.

Ouyang Fei looked at Xiao Qi, then at Li Chengen, and sighed: "General Li, with all due respect, it is easy to repay any debt in this world, but it is not easy to repay the love debt, I only hope that you can get out of the ranks of those who do not admire it as soon as possible." ”

"Uh......" Li Chengen was stunned, and subconsciously looked at Xiao Qi, his expression darkened, but he didn't answer, because he didn't know how to answer, Xiao Qi also fell silent, and the smile on his face turned into a bitter smile.