Chapter 935

At the beginning, Xu Jingzong thought the same thing when he heard Li forget you's words. He felt that Li forget you's Cowhide was too much.

Astronomy, geography, nature, machinery, medicine, literature... Everything is included... It takes a talent of heaven and earth to dare to teach this knowledge, otherwise it will be self humiliating.

Since Li niangyou dares to speak like this, all the professors and teaching assistants of the Academy, including Xu Jingzong, hold their breath and are ready to listen carefully. Can Li niangyou really tell some knowledge that people don't know.

"What I'm going to tell you today is nature."

"Nature is everything in the universe. Nature is the Tao!"

Li forgot to worry about this, which is not a flicker.

The Tang Dynasty advocates Taoism. Naturally, he wants to explain what nature is because of the concept of Taoism.

Naturally, this sentence of Tao also comes from the book Lao Zi Xiang Er Zhu.

Taoism believes that nature, like vitality, is something higher than heaven and earth, which is also in line with the concept of natural philosophy of later generations.

His opening remarks were incomprehensible to all the Mongolian children, but Xu Jingzong and others were unaware of it and listened more and more carefully.

Li forgot to worry about explaining what nature is, and asked the crowd, "fellow students, I'll test you. Who can tell me what color the sun is?"

When he finished asking, the students in the auditorium didn't know how to answer.

Light is light. Where does it come from? What color?

After a long time, someone raised his hand timidly. After being approved by Li forgetful, he stood up and replied, "Sir, the sun has no color."

Li Qieyou smiled and looked at the other students: "do you think what he said is right?"

The students nodded in agreement.

Even the professors and teaching assistants of the Academy were puzzled and didn't understand what Li forgot to worry about.

No one has ever thought about what color the sun is.

The reaction of everyone was naturally expected by Li forgetful, and he was very satisfied.

"Fellow students, you may not know that sunshine has not only colors, but also seven colors: red, orange, yellow, green, blue, indigo and purple," Li said confidently.

His words made the quiet auditorium no longer maintain order, and there were buzzing voices everywhere.

After all, the students are still young and dare not question Li's words.

However, the professors and teaching assistants of the Academy could not help it. After discussing with each other for a while, someone raised his hand and stood up to question.

"Sir, where are the seven colors of the sun? Why have we never seen it?"

Li forgot to worry and smiled: "nonsense, how come you haven't seen the rainbow after the rain? Haven't you seen it? Did the rainbow have color that day?"

The rainbow he mentioned is the ancient name for rainbow. Similar names include flying rainbow and Changhong.

The man was stunned when he heard the speech and couldn't help but retort: "Sir, the rainbow is the rainbow. What's the relationship with the color of the sun?"

Until the Northern Song Dynasty, China had a certain correct understanding of the emergence of rainbow.

For example, Shen Kuo wrote in Mengxi's pen talk, "rainbow, water shadow in the sun, sunshine and rain."

But in ancient Chinese cognition, rainbow is generally regarded as a God who can drink water. The word "Hong" in Oracle Bone Inscriptions is a double headed dragon.

In future generations, if there is a rainbow after the rain, I'm afraid everyone's first reaction is to take photos and send a circle of friends to show off their good luck.

But in Datang, the rainbow is not a good omen.

Rainbow is commonly known as "bar draft" in the folk, thinking that the rainbow will suck up the water somewhere. Therefore, when the rainbow appears, people will knock on the pots and pans and make all kinds of noise in order to scare away the rainbow.

Li Qieyou also met this kind of thing several times after crossing the Tang Dynasty.

After a rain, a rainbow appeared over Dingzhou village. The beautiful boss was very excited. She took Li forgetful and ran out to see the rainbow, but she heard noise everywhere in the village.

The two were surprised and learned the reason after some inquiry.

In this regard, Li forget worry and Su Changqing are also very sad.

I wanted to explain the rainbow principle to Lao Cun Zheng, but it was really difficult to explain, so I simply let them go.

It was precisely because of that experience that Li forgot to worry about today's Encyclopedia course that he chose this topic, that is, to give the students of the academy the reason for the formation of the rainbow.

Li forgot to worry about the questioning of the college assistant, smiled without saying anything, and directly made a gesture to Niu Wu.

Niu Wu immediately took something and carefully placed it on the podium.

This object is a crystal clear cylinder with a triangular cross section.

Everyone can't understand this thing. Anyone who has studied physics in junior high school knows that this thing taken out by Li forgetful worry is a prism!

Li forgot to worry about this prism, but he spent a lot of money to find a colorless and transparent crystal. Please polish it by hand.

Because there are no glass products, Li forgets worry deeply about it.

To this end, he spent a lot of money and asked Cheng Yaojin, Yuchi Jingde and others to help him search everywhere for craftsmen who fired colored glass.

Although he can't burn glass, he also knows that glass is made of sand, to be exact, quartz sand.

There is a word difference between glass and coloured glaze, but in essence, there is no difference between them.

Glass is actually glass. To be exact, it is a kind of glass.

It's just that the materials used for firing glass are different from glass.

Glazed ware appeared as early as the spring and Autumn period and the Warring States period. It was obtained from the by-products produced during the casting of bronze ware.

Coloured glaze, also known as five colored stone, is difficult to produce and valuable. It is even more precious than jade.

Naturally, there are few craftsmen who can burn colored glass.

However, it is not too difficult to collect some glass craftsmen as Li forgets worry.

After these glass craftsmen signed a contract with Li's house, Li forgets to worry about the way they know how to burn glass and leaves it to the craftsmen to figure it out for themselves.

After all, he doesn't understand this kind of thing at all. He only knows that it is fired with quartz sand, and the purer the quartz sand, the better. The fired glass is colorless and transparent.

When making glassware, he only watched TV and blew glass with a long copper tube. As for the specific operation, I'm sorry.

But Li Qieyou believes that the craftsmen of Datang are not stupid at all. He provides enough funds and has the right idea. He believes that glass will be born in Datang soon.

At that time, the Li family will have another cash cow... Alas, too much money is also a pain. I don't know how to spend it

Not to mention how Li forgets to worry about forcing in his heart, the prism made of crystal has aroused the curiosity of all teachers and students in the auditorium. I don't understand what this gadget has to do with the color of the sun that Li forgets to worry about just now.

"Fellow students, next is the moment to witness miracles!"

Li Qieyou motioned Niu Wu to open a window of the auditorium and let the sun shine on the podium