Mu Feng looked at the shattered artillery and felt pain, this was made by the Ministry of Industry with a lot of effort, and it was scrapped like this.

Looking at the mess of broken copper pieces on the ground, Mu Feng's body trembled slightly, and his eyes were a little blank.

Wang Lang walked over and patted him on the shoulder, and said: "It is much better to explode now than to explode on the battlefield, and it is not this mound that will be blown up at that time. ”

Mu Feng nodded and said, "Thank you, Your Majesty, the minister understands." ”

"It's good to get it." As he spoke, Wang Lang walked to a broken cannon barrel, and after asking people to cool down the cannon body with water, he called Mu Feng.

"Look here, the reason for the explosion, on the one hand, is that the cannon body is not thick enough, and more importantly, you see that these potholes are the main reason for this explosion." Wang Lang said slowly.

Mu Feng stared intently at the inner wall of the cannon barrel for a long time.

"It's impossible, the molds we use are extremely smooth, how can this happen." Mu Feng said with some puzzlement.

Wang Lang touched his chin and thought about it, "What kind of mold did you use when you cast the cannon?" Clay molds? ”

Mu Feng nodded and said, "Naturally, it's a clay mold, aren't all the weapons we produce using clay molds?" ”

"The mud mold naturally has the benefits of the mud mold, but the artillery is different, the inner wall of the gun must be extremely smooth, the mud mold will more or less cause trachoma, you have also seen, the artillery with trachoma is basically instinctively put into use, and it has not hurt anyone, but has already injured itself." Wang Lang said in a deep voice.

This kind of technical potter's wheel, others can't interject, and can only stare at the eyes and listen to the heavens.

"Your Majesty, can I use anything other than a clay mold?" Mu Feng asked.

"The mold is just to make it easier for us to get the shape we want, whether it is mud or stone, or wood can be a mold, since mud can't be used, then let's change the way of thinking, for example, use iron to make molds."

"Iron mold? Will this work? Mu Feng asked.

Wang Lang smiled: "Can it be done, just try it, and this artillery in addition to using bronze, you can also try to use steel to make it, compared to some of which one is more reliable, if you can use iron instead of copper, then we can make more artillery, after all, we have only found such a copper mine in the Xia Kingdom, if it is used to make artillery, our copper coinage will not be enough, try to try some other materials." ”

Mu Feng admired Wang Lang's divergent way of thinking, for so long, he has been trying to learn from Wang Lang, but the more he wants to understand, the more he feels that Wang Lang's knowledge is extremely profound, as if this knowledge is in his head from his voice, in his heart, Wang Lang is simply a real god.

Inspired by Wang Lang, Mu Feng's thinking suddenly broadened a lot, if the iron mold can really succeed, then this thing can not only be used to make artillery, but even the output of the iron pot will be greatly increased several times.

Today's test can be said to be a failure, or it can be said to be a success, although the artillery is blown up, but let everyone see the real power of firearms, not only explosive packs, or grenades, this artillery is the weapon of war.

And the magic arrow also opened people's eyes, these two weapons, the generals can't wait to equip these two big killing weapons into their teams.

Hubu Shangshu Kong Er, said with emotion: "Before I also dissuaded Your Majesty from investing too much in the firearms department, thirty percent of the Xia Kingdom's tax revenue was used here, and now it seems that Your Majesty is right, and it is indeed worth it to exchange these two weapons for these two weapons." ”

Wang Lang smiled and said, "Since you are in charge of the Xia Kingdom's money and food, you have become more and more stingy, and trying to get some money from you is even more difficult than killing a dinosaur alone." ”

Kong Er smiled awkwardly and said: "Your Majesty, don't make fun of the ministers, you also know that every place in the Xia Kingdom needs money now, if you give it out at will, the household department will have been emptied long ago, and this money must be used in a useful place." ”

Wang Lang nodded and said, "It is precisely because of you that I chose you for this position." ”

At this time, Kong Yi on the side smiled and said: "Your Majesty, Kong Er, this guy I have watched him grow up, and I have been thinking a lot since I was a child, even if I went to him to approve some money and grain to renovate the yamen, I didn't get a copper plate out, and the yamen of the criminal department was big enough, so I didn't need to renovate it." ”

Wang Lang smiled: "That's right, how many people are there in your criminal department, what are you renovating?" ”

Kong Yi smiled wryly and said, "Your Majesty, believe it or not, the yamen is also a place that Chinese people often go to, so you have to make it look better." ”

Wang Lang put away his smile and said with a straight face: "Just have an office place, the people's fear of officials is not because they live in a beautiful and spacious house, but because they can really benefit them and solve troubles. ”

Seeing Wang Lang's attitude change, Kong Yi hurriedly said: "What Your Majesty said is that the minister remembers, our criminal department will definitely uphold justice for the people." ”

Wang Lang nodded and said, "That's it for today, Mu Feng!" ”

"The minister is here!" Mu Feng said respectfully.

"The firearms department has stepped up the research and development of these two weapons, improved their reliability as much as possible, and strived to equip them to the troops within a year.

"Obey the order!"

"Go back to the palace!" Wang Lang got on a gorgeous deer cart and headed back towards the palace.

In the northern district of Yancheng, in an ordinary campus near the Great Xia School Palace, Wu Feng closed the mathematics textbook, stared at the circle on the paper with his chin on his lean, thoughtful.

"Why is pi 3.14?" Wu Feng muttered to himself.

This problem has been bothering him for a long time, and although he wrote a formula for calculating the circumference and area of a circle in a mathematics textbook, he did not give a specific deduction method, which Wu Feng only knew but did not know.

This is very distressing for him, who is inspired to become an excellent official of the Ministry of Industry in Great Xia, who does not know the process.

Sometimes he even wants to meet Wang Lang through his relationship with Wang He to solve the doubts in his heart, but for some reason, he is very resistant to this method in his heart, he understands that Wang Lang must know the mystery of this, maybe it is through this way that he feels very unfulfilled.

At this time, the courtyard door was pushed open, and a woman walked in with a flat pole, and when she saw Wu Feng looking at the desk blankly, she couldn't help but say:

"Wind, are you still studying? Take a break! ”

Wu Feng came back to his senses and said, "Oh! Mother is back, how are the goods selling today? ”

"It's okay, the women like the jewelry I make, and I sold a lot of it today." The woman laughed.

"Mother's cooking, naturally, is beautiful, you come for a day, I'll cook." Wu Feng got up and walked towards the stove.

The woman laughed and said, "Shall I come, what about your brother?" ”

"Sleep in the house." Wu Feng said.

"Next year he will also reach the age of entering school, and if your brother is half as smart as you, I will be content." The woman said slowly.

Wu Feng said with a smile: "I have something smart, it's just that I work harder than others, Shui is very smart, I believe that my grades in the school palace will also be very good." ”

"Feng, is it really okay if you don't go to the Academy Palace now?" The woman asked.

"The teacher said, I don't have much effect to stay in the school palace now, and the rest of the knowledge can only be taught by myself, by the way, mother, the school palace notified me a few days ago to give a lecture to the students next month." Wu Fengdao.

The woman's face was overjoyed when she heard this, and she hurriedly asked, "Feng, are you going to be a teacher?" ”

Wu Feng nodded and said, "It's not a formal teacher, it's just to teach those children to read and count, and they don't have to go every day." ”

"That's also a teacher, I didn't expect my child to be so capable, wait for your father to come back in the evening, let him buy some wine and meat, and celebrate." The woman said happily.

"Mother, you don't need it, there is still a lot of money in the family, and it looks like the New Year is coming, and you and your brother will also add a few new clothes."

"How much can you use to buy some wine and meat, this is a big deal, I heard others say, as long as you are a teacher for a few years, you are likely to become an official in the future in the future, and our Wu family also has an official." The woman said excitedly.

Seeing his mother so happy, Wu Feng didn't want to ruin her interest, and said: "Mother, if I go to teach, I can have a hundred copper coins every month, you keep these money, and you have worked hard to raise me over the years." ”

When the woman heard this, her eyes were a little moist, Wu Feng was not her first child, the previous children basically died, thinking of the previous life, if she hadn't come to the Xia Kingdom, presumably Wu Feng at this time would have left her like those wild people even if she grew up, where could she hear these touching words The woman turned over, quickly wiped her tears, and said: "People who have read books are different from those wild children." ”

Wu Feng said: "The book says that filial piety comes first, filial piety is the duty of the son of man, reading makes me understand a lot of truths, today's Xia Kingdom is more and more literate, and the Xia Kingdom will definitely be different in the future." ”

The woman nodded and said, "I'm afraid that my mother won't live to that time, and when the time comes, when you go to see me at my grave, tell me about the changes in the Xia Kingdom." ”

"Mother is still young, what do you do with this." Wu Feng frowned.

"Although my mother doesn't know any big truth, but people will die eventually, if I didn't come to Xia Kingdom, my life would have been much better, before, my mother's age was basically about to die, and I don't know how long I can live." The woman sighed.

"Mother, don't say these bad things, the gods will bless you, mother, I'll cook today, let you taste my craft, I learned some good dishes from the chef." Wu Feng said with a smile.

"Well, my son has grown up." The woman smiled.

The woman's words made Wu Feng a little sour, he knew that what his mother said was right, although there were some old people in Xia Kingdom, but the actual age of those old people may be in their forties, and his mother had reached the threshold of old people, and the more and more wrinkles on his face were the best proof, he understood that his mother was running out of time.

After carrying a wooden barrel and coming to the river to fill the water tank at home, Wu Feng went to the trading post to buy some fresh food.

At night, Wu Feng's adoptive father came back and heard the news that his son was going to become a teacher soon, and he smiled and almost couldn't close his mouth.

Wu Feng's cooking skills are not bad, four small dishes, a jar of good wine, and the four members of the Wu family celebrate Wu Feng happily.

The sky gradually darkened, and when everyone else had fallen asleep, Wu Feng came to the small courtyard alone, looking at the starry sky in a daze.

His mother's words weighed heavily on him during the day, and for the first time he felt that death was so close to him.

"Do people really go to the gods when they die, in the story, people's souls will become stars, and I don't know where my stars will be." Wu Feng muttered to himself.

Looking at the twinkling stars in the night sky, Wu Feng's mind suddenly flashed with inspiration.

If the adjacent stars are connected in a line, they are a polygon, and if they are regular shapes.

Thinking of this, Wu Feng suddenly got up from the wooden bench, found a wooden stick in the firewood room, and drew shapes on the ground by the faint moonlight.

From triangles, road squares, pentagons, and hexagons, Wu Feng calculates every time he draws a figure.

As the number of sides gradually increased, Wu Feng found that these polygons would get closer and closer to the circle, and when the edges of the polygons were infinitely smaller, they would completely become round.

This discovery made Wu Feng so excited that he almost forgot the time.

At dawn, when the woman got up to cook, she saw Wu Feng lying on the pyre and falling asleep.

When the woman was about to wake up Wu Feng, she saw that the ground under her feet was full of polygons and some words she didn't recognize.

The woman sighed, carefully bypassed these patterns, walked to Wu Feng's side, patted it gently, and said, "Feng, go back to the house and sleep!" ”

Wu Feng woke up in a daze, rubbed his eyes, yawned, and said, "Mother, is it dawn?" ”

"Why are you asleep outside, it's easy to get sick like this." The woman said worriedly.

Wu Feng shook his head, as if he remembered something, he suddenly jumped up from the ground, looked at the graphics on the ground and couldn't help but breathe a sigh of relief, and muttered, "It's really not a dream." ”

"What dream?" The woman asked, confused.

Wu Feng scratched his head and said, "It's nothing, I'll go sleep for a while, and you don't need to call me for breakfast." ”

"Are these patterns on the ground still useful?" The woman asked.

Wu Feng waved his hand, yawned and said, "It's useless, don't pay attention to them." ”

The woman looked at Wu Feng who walked into the house suspiciously, shook her head, and prepared today's breakfast.