"We are lucky open-pit mines, and it won't be so hard. If we move, we will have mules and horses." Chu Jiu said with great gratitude.

Yao Changsheng nodded, tilted his head slightly and looked at Tao Qini, "Ni'er just said that he used mules and horses to transport coal. Mules and horses could not enter the mine cave at all. The mine cave is usually only a little larger than the dog cave."

"So small?" Tao Qini gestured with her hands. In her impression, the modern mine was fully automatic and mechanized, and it was OK to drive.

Their underground base in the end of the world was as developed as a city.

"It's so small." Yao Changsheng took a deep breath and said, "So a conscientious mine owner uses a donkey to put a big basket on both sides of the donkey saddle, and then transported it out by the donkey. The donkey is smart. After learning once or twice, he knows how to transport it to the wellhead by himself. After unloading it, he will return it by himself. At the beginning of the mine, the mine owner bought a small donkey that had just been born for a few months and kept it in the mine. He feeds water and grass every day until it dies. If it is a slanted shaft that winds down the mine veins, the donkey still has the chance to be pulled out often, bask in the sun on the ground and roll. If it is a straight up and down well, the donkey is hung down and lives in the mine for the rest of his life, and basically he will not see the sun until he dies."

"This is too cruel!" Tao Qini couldn't help but say.

"My brother and sister, this person is not worth much, let alone a donkey. Haven't you heard Changsheng say it? Only conscientious mine owners use donkeys, and most of them are human power." Chu Jiu looked at them with deep eyes and said.

"Now, the coal seam is shallow, we can use big firecrackers." Tao Qini said to them with joy.

"It's just that you've been busy for a few days and have made a lot of firecrackers." Yao Changsheng looked at her in surprise and said.

"Yes! It's blowing." Tao Qini said happily, "Boom... the big firecrackers poured down immediately, and the efficiency and output are far better than manual cutting."

"Yeah! This is good." Chu Jiu's eyes were filled with smiles and echoed.

"That master, madam, the idea is good. Let's see how powerful it is first?" Yao Changsheng reminded the two of them who were obviously overjoyed.

"Okay, I'll open your eyes tomorrow." Tao Qini said proudly, tilting her chin slightly, looking at him proudly.

"Okay!" Yao Changsheng looked at her with gentle and docile eyes and said.

"By the way, we have to say that if the coal reserves are high and it is open again, someone must come to see you!" Tao Qini reminded them.

"This military control." Chu Jiu said without thinking, looking at Tao Qini and asked, "What do you think of this with your brother and sister?"

"I don't have any ideas?" Tao Qini looked at the two of them and shook her head slightly, and her index finger gently slid across the bridge of her nose. "I only ask that the dense forest in the distance should not be destroyed on a large scale."

"If you want to build a house, you can't avoid it. You can't let your brothers use the sky as the curtain and the earth as the mat!" Yao Changsheng said with amber eyes looking at her.

"Then what I mean is, how much to use and how much to replant." Tao Qini smashed her mouth and thought about it and said.

"This is no problem." Chu Jiu responded readily, "It's just why my brother and sister have to make this request."

It can't be said that it is for environmental protection! "Huh?" Tao Qini thought about it after hearing this, "With big firecrackers mining coal, after the explosion, it will definitely be dusty. If there are trees, it can reduce dust."

"What's wrong with this?" Chu Jiu said with a smile and tears, always feeling a little fussy.

"Inhaling too much dust is not good for the body. We cough constantly when we inhaled dust. If we work here for many years, our lungs will definitely not be able to bear it." Tao Qini looked at him with a stern face and said.

"Okay!" Chu Jiu replied readily, isn't it just planting trees!

"Is there any?" Chu Jiu said with a soft look at her.

"It's gone." Tao Qini nodded with a smile, "I don't know much about this. Anyway, if it's a long time, I have to plan it well."

"Yeah!" Yao Changsheng stood up and said, "If you want to plan, you have to check around me to reasonably place food, drink, defecation, and sleep."

"The capable ones work harder, I will leave it to you." Tao Qini said with her face raised and stared at him with little eyes.

"Hehe..." Yao Changsheng lowered his eyes and looked at her with a gentle smile on his face.

"Lord, Lord, is this the so-called coal?" Someone walked up from the depression with a black thing and held it in front of them.

"We really don't know this thing, I haven't seen it before." Chu Jiu looked at the dark thing in his hand, and turned his eyes to Yao Changsheng and said, "You are knowledgeable. Is this coal?"

"Yes!" Yao Changsheng nodded happily and said, "It's black, this side..." pointed to the cut surface and said, "It's shiny and looks oily."

"It's true." Chu Jiu said in the direction of his finger.

"Actually, it's easier to know if you burn it." Yao Changsheng said to them with a smile on his face.

"Why are you still standing there? Make a fire quickly." Chu Jiu urged to look at them.

"Master, don't worry, you have to clear out the open space first. Don't stop this dead grass, we can't run away." Yao Changsheng looked at him with a gentle expression and said with a smile, "Now it's sure it's here, so I'm not afraid of anything."

"Okay." Chu Jiu nodded with a smile. He was so excited to rub his hands. The surprise came more than expected. How could he not be excited?

Five hundred people scattered into the depression and only five pieces of coal were found. The coal was not small, and one piece was at least the size of a basketball.

This was an unexpected gain, and it was a surprise.

Take the tools, clean up the weeds, and clear out a large open space.

Light a bonfire and smash the coal into small pieces, which is conducive to ignition and can also burn fully.

They put the ignition coal blocks together and can be compared with the burning wood intuitively.

Chu Jiu looked at the burning red coal, "It's high in heat and resistant to burning. It's indeed better than firewood, so you don't have to add firewood all the time."

"Only when the heat is high can iron be turned into water." Yao Changsheng looked at the high coal blocks where the flames were flying, "There is also a kind of coal recorded in the book that is specially used for iron smelting, which is even more powerful than this one, and says coke."

"Can this be found?" Chu Jiu's eyes fell on Tao Qini and said, "Brother and sister-in-law!"

Tao Qini was stunned when she heard this, then smiled and said, "This master should ask him." She pointed to Yao Changsheng and said, "My husband."

"The master did not find this, how do you say it? Coke, as the name suggests, has been specially treated." Yao Changsheng looked at him and explained carefully, "I'm sorry, I don't know how to do it at the moment?"

"This is already very good." Chu Jiu pursed his lips and said, instead comforting him, "We are looking for this slowly from the book."

Tao Qini curled her lips when she heard this, and she disagreed.

Chu Jiu crossed the bonfire and looked at Tao Qini's expression, and asked in surprise, "Your brother and sister-in-law have something to say."

"Madam." Yao Changsheng tilted his head slightly and looked at her with concern.

"Me?" Tao Qini pointed to herself and said suddenly, "I have to study this,"

"Learn from research?" Chu Jiu and Yao Changsheng said together, with a look of confusion.

"You don't think this book is just so straightforward! How should you do it step by step?" Tao Qini said with bright eyes looking at them, her black pupils flashing gently, and she said bluntly, "The records in this book are just very apparent, there is no specific operation, and there is no deep digging. This requires exploration, and it is difficult to explore in the dark!"

"Deep digging?" Yao Changsheng raised his eyebrows and said to her.

"For example, why can this coal burn, why can other black stones not burn?" Tao Qini pointed at the red coal channel.

"This..." Yao Changsheng was asked, scratching his head, "I don't know." He looked at her mouth open and closed, and couldn't hold it in, "My wife wants to say it, just say enough at once."

Tao Qini blinked and looked at him, "Is that OK?" The aftermath of his eyes looked at Chu Jiu, "He is there?"

Yao Changsheng looked at her and nodded slightly, "Yes!"

Tao Qini clenched her fists and coughed lightly, "Then I'm going to say too much, I'll almost suffocate me to death."

"You can tell." Yao Changsheng said with a curvy look at her with a smile.

Tao Qini gave him annoyed and said, "Take me hatching eggs as an example, our body temperature is different from the body temperature of the hen. The body temperature of the hen is obviously higher. If you want to hatch the chick, the temperature of the kang must reach the body temperature of the hen, and it must always be maintained. However, this body temperature cannot be as high as a measure."

"Then how did you solve it?" Chu Jiu asked curiously.

"Social feeling!" Tao Qini smiled bitterly, "Use your own perception."

"In addition to you, isn't it difficult to master this technology now? Can you still hatch eggs in large quantities?" Chu Jiu frowned and looked at her and said, "Can you still achieve this agricultural aspect in brothers and sisters?"

"Erniu and the others have mastered it. I don't know how many times it has failed. It is difficult to promote it in a short period of time." Tao Qini shook her head slightly, "This technique is not easy to master." The brown eyes leaped and looked at them, "It would be great if the body temperature could be like a measure, with specific numbers."

"This..." Yao Changsheng looked at her with deep and clear eyes, and he had no solution, because he didn't have it in the book, and he was a little depressed.

"What's wrong with Changsheng?" Chu Jiu looked at the listless Yao Changsheng with concern and asked.

"I've been hit." Tao Qini said with a clear look at Yao Changsheng and said unkindly.

"What's this blow?" Chu Jiu looked at them in confusion, "Don't gloat, brother and sister, can you explain?" He looked at them anxiously, "Don't keep it a secret."

Yao Changsheng raised his head and took a deep breath and looked at him, "What should I say? It's what my wife said, for example, Iron smelting, which was found in the Warring States Period. Iron farm tools made it easier for us to open up wastelands and reclaim land. Iron weapons and armor fought the Huns in the Western Han Dynasty to search for teeth." He raised his arm and waved his murderous aura and said, "If the Han sword is unsheathed, it will definitely drink blood; the sword tips are all the territory; the horses step on the Huns and seal the wolf's residence... All the sun and the moon shine are Han territory, and the rivers reach them are Han ministers!"

Tao Qini looked at them with excitement and passion, and said that she was a militant, but they didn't give in.

Tao Qini coughed twice, and her body approached Yao Changsheng slightly and said, "I know that era was great and I was proud of being a Han Chinese." She said in a deep voice, "But the key point."

"Oh!" Yao Changsheng nodded obediently and pinched his ears, "It is the reason why this red stone block can burn iron. The master should also know the kiln. If we throw the iron blocks in, how much heat we can turn the iron into water and make the shape we want." He looked at him with a burning look, "We don't know why these are?"

"The most popular thing in maritime trade is porcelain. We don't know why some soil can be used, and some soil can't." Yao Changsheng said with a quiet look at him.

Tao Qini looked at him with little stars and finally got to the point.

To be honest, I have read a lot of books, only phenomenal expressions, not knowing the principles, and not knowing the internal chemical changes.

"What do you mean after you said this?" Chu Jiu scratched his head and said humbly, "What is the practical significance?"

"The practical significance is that what we are doing is scoffed at." Yao Changsheng said bluntly with deep eyes looking at him.

"We don't dislike it, not at all." Chu Jiu said with a smile when he heard this, "We are Han Xin's troops, the more we have, the better."

Yao Changsheng smiled when he heard this, and looked at him with deep eyes and continued, "There are hundreds of schools of thought in the pre-Qin period. The Mohist school is good at mechanical techniques, but the Mohist school is quickly treated coldly, and the skilled craftsmen were also criticized by Confucian scholars as strange skills and tricks." A sneer passed by his lips and said sarcastically, "But they use them both to attack and defend the city." The black eyes swayed gently, "Everything is inferior but to high school reading. The simplest craftsman, the carpenter, is looked down upon by people. How many praises and praises have been received in this historical book over the past thousand years."

"Yes! Lu Ban, general Mo Ye." Chu Jiu immediately said when he heard this.

Tao Qini looked at Yao Changsheng who was criticized and smiled unkindly.

"The Lord is right, but these two famous ones are just these two!" Yao Changsheng chuckled and said, "What I want to say is that our ancestors left us with many brilliant works, Confucius, Lao Tzu, Zhuangzi, Mencius, grandson, Guiguzi, and wrote books, but they were related to 'people'. Our ancestors, scholars of literati from all ages, wrote a large number of classics, collections of essays, and historical books. No matter which literati's study, there are countless contents in it, and how should we describe it?"
Chapter completed!