Xie Jin did not notice Li Jie's arrival. After experiencing the initial self-doubt, he quickly cheered up and listened carefully. In terms of academics, he was a person who refused to give up easily, otherwise he would not have passed the Jinshi exam at a young age. Although he could not understand some of what Wang Sichen said on the stage, he used his ability to remember everything that he never remembered, and kept everything that the other party said in his heart.

After Wang Sichen finished his class, someone immediately stood up to raise his questions. Wang Sichen also answered one by one. Xie Jin also wanted to stand up and ask questions, but he hesitated for a while and finally gave up. First, he was embarrassed, and second, he had too many questions in his heart, which made him not know where to ask.

After answering the questions raised by everyone, Wang Sichen also walked off the podium and then changed to another person to give a lecture. But what was surprising was that this person was actually wearing the costumes of a sage official. He did not talk about astronomy, but talked about an experience he heard from the craftsmen.

It turns out that craftsmen have long discovered that using a movable pulley to hang things can save half of the effort, but if the pulley is fixed to a high place to hang things, it will not save any effort at all.

It is impossible to verify when the above phenomenon was discovered. The craftsmen used this method from generation to generation, but they never considered the reasons. After all, this little official had read books, so he quickly became interested in the role of pulleys. However, he did not have an accurate explanation. Today, he proposed it, just to use everyone's power to explain the truth.

Many people were also very interested in the phenomenon of this pulley, and they expressed their opinions at this time. In the end, even Xie Jin couldn't help but stand up and speak, right? Let's talk about it again, but this warm atmosphere made him want to participate.

Li Jie also stood up and walked onto the podium at the end. When he appeared? Everyone was quiet? However, Li Jie did not help these people answer their previous questions. Although he could easily tell these people the answers? But as the saying goes, it is better to teach people how to fish. The key is to give them the spirit of seeking science? So Li Jie only gave them some key points, but rarely told them the answers directly.

I saw Li Jie looking around everyone after he came to the stage. When he saw Xie Jin, he smiled and greeted the other party, then cleared his throat and said, "Today I will bring you a very interesting little thing."

Li Jie said as he took out a small box from his arms, and then took out a teardrop-shaped glass from the box. He showed it to everyone, "Everyone should know glass? The glass workshop is not far away, so I want to ask, do you think glass is strong?"

"Glass is like porcelain, it should be a very fragile thing. Even if it falls into place, it will break? It is far from being strong!" Someone below immediately replied loudly.

"Yes, the glass is very fragile? But do you believe it or not? The piece of glass in my hand cannot be broken even with a hammer?" Li Jie asked with a smile again.

"Li Banju, aren't you kidding?" Zhu Yunxiu shouted without believingly. Although he came with Li Jie, he didn't know what Li Jie gave.

"Since Your Highness doesn't believe it? Then why don't you try it yourself?" Li Jie smiled again.

"Okay!" Zhu Yunxi agreed immediately, stood up and went on stage.

Li Jie also took out the prepared hammer and asked Zhu Yunyu to test it. After confirming that there was no problem with the hammer, Li Jie then placed the water drop-shaped glass on the table and then asked Zhu Yunyu to hit the big head of the glass.

Zhu Yunxiu didn't dare to use too much force at the beginning, but just tapped the glass gently, but found that the glass was nothing, which made him slowly increase his strength, but the glass on the table was still the same. In the end, he became anxious and smashed it with all his strength, but the seemingly fragile glass was still safe and sound.

"It's strange, Li Bandu, are you sure this is glass, not transparent steel or something?" Zhu Yunqiu smashed it hard for a few times, but finally gave up, but began to doubt the authenticity of the glass.

Li Jie laughed and did not rush to explain, but said to the people below again: "Whoever wants to try it out, even if you can come on stage!"

The people below could not wait any longer and immediately went on stage to test. But even though so many of them smashed the glass with all their might, the small piece of glass was nothing. In the end, everyone had the same suspicion as Zhu Yunxiu.

Seeing that everyone gave up, Li Jie smiled again and said, "Don't doubt it, this is just an ordinary piece of glass, but you can't smash it with a hammer, but I can turn it into powder in an instant!"

Li Jie said that, taking out a small iron pliers, then clamped the tail of the water droplet-shaped glass, and asked Zhu Yunqiu and others to stand a little further, turning his head over, then he exerted a light force, and with a "bang", the water droplet-shaped glass seemed to explode, completely turning into a sub-glass powder and splashing everywhere.

"Boom~" Everyone was in a panic. After all, this phenomenon was so amazing. The glass that they could not even smash with a hammer was broken by Li Jie. If they hadn't seen it with their own eyes, they wouldn't believe it.

"Li Banju, can you do magic?" Zhu Yunxiu shouted in shock. He could not think of any other explanation except spells.

"This is not a spell, but a physical phenomenon. This water drop-shaped glass is actually formed by pouring it into the water after the glass melts. This shape of glass has a characteristic, that is, its head is extremely hard and cannot be smashed with an iron hammer, but as long as you gently clamp its tail, it will explode and smash it with a slight force." Li Jie explained with a smile.

This is actually a glass product called Rupert's Tears later, but now that Li Jie has made it, there is really no need to add another name to the British colonist.

After Li Jie said that, he took out a few drop-shaped glasses from the box and asked Zhu Yunxiu and the others to test them themselves. However, this thing was still a bit dangerous when it exploded, and it would be troublesome if it splashed into his eyes. So Li Jie also reminded them to be careful.

Zhu Yunxi and others were a little suspicious at first, but after experimenting with it, they had to believe this magical phenomenon, which also made them surround Li Jie and start asking about the reason for this phenomenon.

Li Jie still did not explain it, but just asked them to study it by themselves. In fact, Li Jie himself couldn't explain it clearly, because this phenomenon involved materials science and mechanics in later generations. Even people with college education rarely understood this phenomenon, let alone these ancients.

After the class was finished, it was time to end. Li Jie and Zhu Yunxiu packed up their things and prepared to leave. However, at this moment, Xie Jin came to Li Jie, hesitated for a moment before speaking, "Brother Li, can that...can you give me one of that water-drop-shaped glass?"

"Brother Jie, do you like this?" Li Jie said in surprise when he heard this.

"I'm very interested in it, so I want to go back and study it carefully." Xie Jin said with a red face. Li Jie's demonstration just now aroused his great interest, and it was even like he was pushing a window for him, allowing him to see an unprecedented world.

"No problem!" Li Jie said as he picked out a water drop-shaped glass from the box and gave it to the other party, and then smiled again, "In fact, this water drop-shaped glass and the previous pulley phenomenon are all characteristics that all things in the world themselves have. I collectively call them physics, such as why the wind flows, why the ship can float on the water, etc. These seem ordinary, but contain endless truths. I hope Brother Jie, you can solve these mysteries for the people of the world in the future!"

"Physics?" Xie Jin also chewed the meaning of these two words when he heard this. The window that opened in his heart seemed to be brighter, and an unprecedented road seemed to appear in front of him.

"Brother Li, can I come to listen to the class in the future?" Xie Jin asked again with a firm expression.

"That's natural. This textbook is open. Anyone can come to listen to the lecture or express his own opinions. I hope that Brother Jie can actively participate in the future!" Li Jie nodded immediately. This was the purpose of asking Xie Jin to come. With Xie Jin's intelligence, it was a waste to put it in the officialdom.

In the next few days, Li Jie often came to the hot air balloon workshop to teach, and he would meet Xie Jin every time. At first, the other party just listened carefully, and later he began to actively participate in it, and even took the initiative to give speeches on stage. Although Xie Jin became a monk halfway, with his intelligence, he quickly followed and even expressed some novel opinions, which attracted the attention of many people.

This classroom located in the hot air balloon workshop was originally just Li Jie's unintentional work. It was originally just to teach mathematics to the officials of the Imperial Heaven Supervision, but later the contents of physics, chemistry and even biology began to be moved to the stage to give speeches, which attracted more interested people, including officials and officials, and even some scholars from the capital came here.

Although the scale of this class is still very small and is only spread in a small circle, Li Jie believes that as time goes by, the scale of this class will become larger and larger, and more people will participate, and the content generated in the class will be slowly spread, and sooner or later it will cause qualitative changes from quantitative change.

As time goes by, Li Jie is also preparing to go to Ningbo. However, on this day, Mu Sheng suddenly came uninvited, holding a jar of strong wine in his hand. When he saw Li Jie, he immediately said: "Brother Li, I'm here to drink with you. Today we won't be drunk!"

Li Jie was shocked when he saw Mu Sheng's appearance. He saw that the other party's eyes were red, his cheeks were sunken, his whole body was so thin that he was chaotic that he looked depressed and unsuccessful. Thinking about the last time he met, Mu Sheng was still full of energy. Such a big change occurred in just a few days. Needless to ask, it must be a problem with the Tie Cejun's training.
Chapter completed!