Lu Shuren once said that if you are good at learning mathematics, physics and chemistry, you will not be afraid of traveling all over the world.

This statement is not fabricated out of thin air. Mathematics, physics, and chemistry are the cornerstones of the first industrial revolution in modern times.

Liu Hongjian began to speak out in front of the stage with shameless words, and the front-row teachers, including Chongzhen, frowned.

I thought that our Ming Dynasty only had Confucianism, Neo-Confucianism, the principles of all things, and physics, which I have never heard of for most of my life.

The mountain leader must feel that he has no sense of existence in the engineering school, but if you want to find a sense of existence, you often come to the engineering school. You are the mountain leader, why don’t you come once a month?

Even if you want to find a sense of existence, just call some disciples to come, why bother calling them together?

"The mountain leader, Cheng and Zhu Neo-Confucianism are the learning of saints. My Ming Dynasty relies on this learning to educate all the people. Even if you are the mountain leader, you must not slander the learning of saints!" A teacher in the second row was more stubborn and stood up to retort.

"Dare you ask about the name of this gentleman?" Liu Hongjian had known for a long time that his remarks were a bit ruthless for these older teachers, so he was not annoyed when he saw someone refuting it bluntly.

"I am the teacher of civil engineering. Li Cunhou." Although this man knew that refuting the mountain leader would be fired, he still said stubbornly.

Cheng and Zhu Neo-Confucianism was deeply rooted in the hearts of the people, and it could even be said to be deeply rooted in the bones of all people. Few dared to question it. He himself had to change his career and live a life of engineering.

"So can Mr. Li use Cheng Zhu Zhixue to answer some questions for the chief of the mountain?" Liu Hongjian said again.

"I am very knowledgeable, but I ask the mountain manager to ask questions. Everything I know will be said." Li Cunhou said with his head twisted.

"Dare you ask why sir, the sun rises east and sets west?" Liu Hongjian said casually.

"The golden crow carries the sun and lies in the sky, and the sun, moon, stars and stars are like this. This is the theory of the Huntian." Li Cunhou thought for a long time but could not find the answer from Cheng-Zhu Neo-Confucianism, so he had to move out the Huntian theory of the ancestors.

Liu Hongjian was amused when he heard this. The ancients believed that the earth was the center of the universe, that the sky was still, that the sun, moon, and stars were circling the earth, but they had never explored the right or wrong or the reasons.

"Then the Lord of the Mountain asked again, why do you fall down instead of going up when the fruit on the fruit tree is ripe?

Why do fireflies shine? Why do sunflowers always face the sun?

Why do all things have spring flowers and autumn fruits, and why do leaves change color?

Why can white gas be exhaled in winter but not seen in summer?

Why do you see lightning first and then you can hear thunder?

…”

Liu Hongjian knew that as long as he was asked to explain, he would definitely stump Li Cunhou, but he did not ask the bottom line, but instead raised a series of new questions.

"This..." Li Cunhou was stunned by a lot of questions.

He racked his brains to find the answer from the Confucian classics he had learned, but his face turned red and he didn't know the answer to any of the questions.

"I am not good at learning, but I cannot understand the essence of Confucianism, but it is not the study of sages that cannot be explained..." Li Cunxiao saw that all his eyes were gathered on him, and he felt that his face was hot.

"Mr. Li, please sit down!" Liu Hongjian waved his hand and let the hesitant Li Village sit down, and then lifted the red cloth on a tray on the table.

The two trays on the table are props for Liu Hongjian's teaching this time. In the opened tray, there was a cooked potato, two metal wires of different colors, and a small cup made of glass.

Several ants in the glass crawled around the bottom of the cup, trying to find a way out to escape.

"Please look, here is a cooked potato, a copper wire, a zinc wire, and a few living ants." Liu Hongjian took the plate and walked around the teachings, and then placed the plate on the table in front of Chongzhen.

Everyone didn't know what elixir Liu Hongjian sold in the gourd, and they all looked at the pallet.

Then Liu Hongjian inserted the copper wire into one end of the potato, inserted the zinc wire into the other end, and wrapped it with a piece of cotton cloth on the copper wire and zinc wire for insulation.

"The moment to witness the miracle is here, please look at it!" Liu Hongjian pinched the copper wire with his left hand and the zinc wire with his right hand, touching the ends of the two metal wires together.

Sizzle - A small spark flashed from the end, and the spark was so small that it could not be seen at all if you stared at it.

Uncle Chongzhen, who was closest to him, shivered. He had never seen such a magical thing before. Uncle Song and Uncle Xu were around him, and his eyes widened.

Liu Hongjian said nothing and poked two metal wires at the ant in the glass.

As soon as the two metal wires touched, a poor ant was punished by God. After struggling for a while, he lay in the glass cup and stopped moving. Then a little burnt smell appeared in the air.

The ant was poisoned to death by potatoes?

Chongzhen looked around and looked at Uncle Song and Uncle Xu, his eyes were full of shock. What is the reason for this? Why is there such a strange thing?

They couldn't figure out why except that the potato might be poisoned.

Liu Hongjian poked at other ants one after another, and three of them fell down before they had no effect.

Then Liu Hongjian pulled out the metal wire from the potatoes, peeled them and ate half of the potatoes in one bite.

Uncle Chongzhen's face immediately changed. He thought to himself that even if you want to teach, you can't make such a fight. What if you are poisoned to death? I believe you, can't it be possible?

"What you saw just now was not a miracle, it was called science! It was also called electricity! It was a simple physical phenomenon." Liu Hongjian brought the tray to the table in front of the podium and said.

Potato power generation was the first small experiment learned by later primary school students when they came into contact with physics, and its principles were well known to everyone.

It is mainly necessary to use two pieces of metal, one as the anode, which is an electrode with a low potential, such as zinc, and the other as the cathode, which is a positively charged electrode, such as metal copper.

The acidic substances inside potatoes react chemically with zinc and copper, and when electrons flow from one end to the other, electricity is released.

The chemical properties of metal zinc are more active than copper. When these two metals are in the acid liquid at the same time, zinc will lose electrons. These lost electrons pass along the wire to the copper sheet, forming an electric current.

"If I, a student of the Ming Dynasty, can I understand the principles in the future, I can benefit the people. Electricity can be used for lighting and abandon candles and kerosene, and electricity can also be used to drive equipment and save manpower..."

Liu Hongjian simply raised a few chestnuts, but it seemed that he was confused, including Uncle Chongzhen.

They have never seen what an electric light looks like, nor have they seen such an electric drive device. They can't even imagine what it was like.

"Well... If the current is increased by a hundred times, no matter whether humans or animals touch it, they will die!" Liu Hongjian felt that the chestnut he raised just now was not straightforward enough, so he changed his words.

After saying this, Chongzhen's old eyes immediately brightened.
Chapter completed!