Song Beiyun bit his pen with his dark circles in his eyes. The books in front of him were already filled with his experience notes. Although the problem of writing things in the book was always criticized by Yu Sheng, his bad habits were difficult to change, and over time, he would no longer talk about him.

Yu Sheng next to him was not that comfortable. He had a messy hair, and was filled with papers and various classics. He seemed to be growing in a pile of books, and he was so listless that he didn't look like he was.

"Brother Yusheng, you can't sleep. There are three sets of papers." Song Beiyun picked up a piece of muffin made by Aunt Hong and put it in his mouth: "It's still early in the morning. Why are you drowsy? Do you still want to study?"

Aunt Hong, who was standing beside her, looked at her with a distressed look. She frowned and walked up to her two big bowls of rice soup in front of Yusheng and Song Beiyun: "If you work hard, don't recite it. It's okay to have a rest for a while."

"Mom..." Yusheng raised his head and said haggardly: "Beiyun is right. If I fail the exam again, how can I be worthy of my father's instructions before my death? Don't worry about me, go and go to the spring festival with Qiaoqiao."

Song Beiyun took the rice soup and took a sip: "In the afternoon, we will start memorizing poetry. To sum up the poem titles of these years, memorize three poems for each lyric card, three poems for each poem, three poems for each poem, three poems for seven poems, three quatrains, three quatrains, and three regular poems. I have calculated that I have about 660 poems for me. Even if you can chew this bone, you have to chew it, and even if you can't chew it."

When he heard this number, Yu Sheng collapsed. Aunt Hong opened her mouth but couldn't say anything, so she could only sigh silently and walked downstairs with a basket.

After going down, Aqiao happened to be packing up the wild ferns that he had picked in the morning. After seeing Aunt Hong come down, she raised her head and asked, "Aunt Hong, I'll leave after I finish washing later."

Aunt Hong nodded and sighed silently: "A Qiao, you go and persuade them, those two people are like crazy..."

"Aunt Hong..." A Qiao picked the bracken off the old stem, put it in the basket, raised her head and said to Aunt Hong: "You are wrong to Brother Yusheng and Beiyun. This reading should be so hard. If you can't even bear these hardships, then what else can you read? It's better to go to work early."

"Reason is this principle, that is..."

"Aunt Hong, don't talk about this, why bother Brother Yusheng again? Go to Chunji earlier and buy them some delicious food to make up for it. Then our Xiaolianzhuang will have two top scholars together, so the person who proposes marriage to Brother Yusheng will not be able to break the threshold?"

"Silly girl, there can only be one top scorer." Aunt Hong touched Aqiao's head lovingly: "Who do you want to be the top scorer?"

"Brother Yusheng, it's better for Brother Yusheng to be the top scorer."

"What about Beiyun?"

"That guy is very happy to study, and he still hopes to be the top scorer? Anyway, there can only be one top scorer, so why not let Brother Yusheng be the one."

"Silly girl, no wonder Beiyun loves you so much. You are really the heart of aunt." Aunt Hong squatted down and rubbed Aqiao's face: "Cheap quickly, otherwise there will be more people in a while."

At this point, the Qingming Festival is not all a festival to worship ancestors. Qingming Festival is just the solar term. The real festival is the previous Cold Food Festival. This is a day when men and women gather to celebrate the spring. People have markets to visit, while wealthy families go to the suburbs for a picnic. Men, women, young and old eat the cold food to welcome the spring and hope for a good harvest.

There has always been a saying that the cold food industry has disappeared after the cold food industry and the flower branches are beautiful after the outing.

It was indeed raining last night, but it was a sunny day early this morning, as if it had swept away the haze of the whole winter. Most of the farmers' children would follow their father to the mountain to look for bamboo shoots, ferns and ground mushrooms.

"When I went to the market, we would buy some spring bamboo shoots." Aunt Hong said, then looked at the bacon and chicken on the beam of the house. She pondered for a moment: "Get them salty steamed bamboo shoots in the evening."

"Well, okay, I'm here." A Qiao hung the washed fern basket on the rope in the corridor and wiped his hands on the apron: "I'll change my shoes."

At this moment, Song Beiyun lay down at the window and watched them walk out of the door. He turned around and smiled at Yusheng and said, "Brother Yusheng, Aunt Hong and Qiaoqiao are going to buy bamboo shoots. You will have a good time tonight."

Yusheng raised his head silently and sighed softly: "I don't have an appetite..."

"You don't understand this. The bamboo shoots in spring are the most tender, but they are vegetarian and heartburn. But if you wrap rice noodles with the bacon that is suitable for weight and thin, put a braised chicken and steam them in the pot. The meat oil seeps down, and the rice noodles sucks the oil and bamboo shoots and oil. The meat is also dipped in the water vapor of the bamboo shoots. It is neither soft nor hard. One bite of bacon and one bite of bamboo shoots and another bite of rice. That taste, tsk..." Song Beiyun shook his mouth: "I'm greedy."

"You should study well, don't be a lazy and greedy thing." Yu Sheng also swallowed: "Read the book quickly."

"Look at books."

Song Beiyun said, but he was not willing to read honestly. In just two minutes, he suddenly sat upright: "Oh, by the way, my master ordered me to pay homage to the Master's tablets during the Qingming Festival, but I forgot!"

Yusheng raised his head and said dissatisfiedly: "Why are you always losing everything? This is a big deal. Go quickly!"

"Get orders!"

Song Beiyun jumped and ran away like a monkey. But he was not going to worship his ancestors. When he turned his head, he crawled into the woods five or six hundred meters away from the village. There was a rain shelter inside, which was his secret base.

He touched the calciner that he had brought from Zuo Rou and found that the temperature had almost cooled down. Then he took out a piece of wet cloth and wrapped his entire head, then put the gloves made of sheep casing on his hands, and then took out a simple goggles that he had polished with crystal from his arms. After all the protection was ready, he sat next to him and looked at a jar.

"Success...must be successful!"

He slowly and carefully opened the jar, and a yellowish-brown sticky liquid was exposed. He didn't even dare to breathe heavily. He just used a bamboo stick to penetrate and let it sit for a while, he took out the bamboo stick and found that the part immersed in the liquid had been carbonized. He carefully placed the bamboo stick in the furnace and burned it. Then he sat on the ground and laughed at the jar.

"Concentrated sulfuric acid, get!"

This distillation and calciner is really easy to use, and its sealing is great! It is the best process he has seen since this era. Although there is no corrosion-resistant rubber, that layer of soft paint has a substitute effect. Although it is more expensive than rubber and easy to consume, it is better than none!

The dilute sulfuric acid produced with alum and caustic soda was distilled overnight. Although the viscosity of concentrated sulfuric acid in half of the jar was of average quality, it was already very, very amazing to get this in this era.

After the essential oil is produced, the oil is left out of the leachate, and the fat is esterified with the by-product of salicylic acid to obtain glycerol.

After the concentrated sulfuric acid is obtained, nitric acid can be obtained through the Western Regions saltpeter, that is, sodium saltpeter with average purity that he bought from the Heike merchants, and then mixed and distilled with dilute nitric acid and concentrated sulfuric acid one to one to obtain concentrated nitric acid.

So now if Song Beiyun is a huge technology tree, the two lowest options have been activated. First of all, he can now prepare two branch lines through glycerol, nitric acid and sulfuric acid, and first of all, fertilizers.

Fertilizer is one of the greatest inventions in human history. Fertilizer is one of the important conditions for getting humans out of hunger. By fertilizing the land and greenhouses, Song Beiyun can start plant domestication. After plant domestication, it will be screened for high-yield species and drought-resistant, flood-resistant and disease-resistant species. Next is large-scale planting and the cultivation of grain and vegetable in the southern region for two seasons a year.

Maybe everyone is unhappy without meat, but as long as there is food and food, you won’t starve to death!

And what is the other branch? Most people can understand what these three things are made at a ratio of 1:1:7.

Yes, nitroglycerin.

If fertilizer is one of the things that have the most living people, then its brother nitroglycerin is one of the things that have the most killed people.

Nitrifying glycerin plus the diatom mud produced by tossing algae before and the raw material for making sodium sulfuric acid can produce the most notorious gunpowder in ancient and modern history - yellow gunpowder.

And its other well-known name is tnt.

"Long live chemistry! Long live chemistry!!!" Song Beiyun sat on the ground and danced like crazy: "A small step for me is a big step for mankind!"

After calming down a little, Song Beiyun sat on the ground and began to linger in his mind... Maybe hundreds or thousands of years later, people sat in a certain auditorium well dressed, and then the host stood on it and took out an envelope, reading in a brief and sonorous tone, "The winner of the Song Beiyun Chemistry Award is..."

"Oh my God! This is so happy!" Song Beiyun held the tree and shook back and forth: "No, no, too fast, too fast..."

After he really calmed down, he knew that he had really only taken a small step. It took almost five years to really produce concentrated sulfuric acid. This progress is not good! Everything is still really starting now, and there is still a long time to go in the future.

After forcibly calming down, Song Beiyun squatted on the ground and stared at the can of concentrated sulfuric acid, then squinted his eyes and made a very difficult choice.

TNT and fertilizers, start research simultaneously!

He hurriedly hid the equipment, then put the jar of concentrated sulfuric acid sealed with a porcelain plate with a wet red mud and carried it back to his room. He took off his simple protective clothing and returned to the place where he was studying.

But at this moment, there is nothing else in his mind, full of hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon.

"Electroplating, right, right...wind power generation, electroplating technology. With electroplating technology, acidified batteries can be made, lighted 800 years in advance, and then...right, right, purification and purification technology, rubber... I want rubber."

"Banana?" Yusheng turned his head: "Want to eat banana?"

Song Beiyun smiled and said, "It's okay... Brother Yusheng, I'm so happy!!!"
Chapter completed!