The question Pei Yun said was for everyone, but after Jiu'er heard it, she had a different feeling in her heart.

Just now, he raised the question, and at this time, Pei Yun encouraged everyone to ask questions, which was not a kind of praise for himself.

Thinking of this, Jiu'er couldn't help but feel proud.

It's an amazing feeling.

Really speaking, I was smart when I was a child, and I received a lot of education from teachers, and the teachers praised me a lot, but I never took it seriously, I just took it for granted, and there was nothing to be proud of.

But why, he was proud at this time, and again, he didn't praise himself positively.

Jiu'er thought about it, and finally explained that it was his previous sarcastic reprimand for himself, which made him feel that his praise was rare.

Also, it was the question he asked that led him to the latter words.

In other words, he can say something, and his own credit is indispensable.

With such thoughts, what Jiu'er said to Pei Yun was to listen to it with relish.

I couldn't help but think.

Is it really as he said, Gewu can really change the world, and can really turn decay into magic.

And what happened next was to make her understand what it means to wait and see.

Pei Yun: "Next, I will do a very interesting thing with you, the purpose is to let you know how mysterious the knowledge you are going to learn will be. ”

"How to say it, it should be regarded as giving you a sense of mission, and when a person has a sense of mission, he will strive for it."

"And what I want you to get is that one day, with your struggle, you can turn the mystery you have seen into reality."

"Alright, come with me to the yard."

A group of people came to the courtyard in confusion, thinking about how to go to the courtyard for class.

At this time, the yard is sunny, and the light is not too big or small, just right.

"Childe, things are ready." Qin Qi'er, who had been waiting in the courtyard for a long time, said.

Pei Yun is teaching students, and Qin Qi'er is in charge of being an assistant.

There are many unconventional contents in the lessons that Pei Yun wants to give to students, which also gives Qin Qi'er many opportunities to be an assistant.

In front of Qin Qi'er was a pile of dry weeds.

The five students, led by Jiu'er, all looked curious.

Among the five of them, except for one Jiu'er, the others are all children, and they are always curious about things they don't understand.

They don't understand what they are doing with just a pile of hay, and what does this have to do with the mystery mentioned before.

Pei Yun nodded to Qin Qi'er, signaling that he could start, and then said to the student: "It's all optimistic, see what she will do next." ”

For a while, all ten eyes were looking at Qin Qi'er.

I saw Qin Qi'er's hand on the haystack.

Just when everyone was wondering what they were doing, there was an uproar.

"It's on fire." I don't know who shouted.

It was indeed on fire, and it was a haystack that caught fire.

For no reason, why did it catch fire?

The students looked at each other, and they only saw Qin Qi'er putting his hand on the haystack.

Is this what Qin Qi'er did?

But how?

Is it a trick?

Pei Yun spoke: "She set the grass on fire, do you know how she lit it." ”

Faced with such a question, students immediately became interested.

"She is a heavenly immortal, and she used immortal magic to ignite the grass."

Hearing this, Qin Qi'er smiled happily, this is praising herself.

said that he was a heavenly immortal, then he was not very good-looking.

Pei Yun's tone became serious, and he said: "This is not some immortal art, you can do such things, don't say such things in class in the future, such words are meaningless." ”

Jiu'er: "Is there something in her hand?" ”

For things, you need to have an observant eye, and Jiu'er obviously has it.

Pei Yun: "Let her see what you have in your hand." ”

Qin Qi'er showed the things in his hand.

If you hadn't put things in front of everyone, you wouldn't have been able to find them.

It's a clear, hard object.

The other students had never seen anything like this, but their eyes were glowing, and it was so beautiful.

Only Jiu'er was surprised: "It's Liuli." ”

Glass is a treasure, it is a delicate luxury, and the value is even more expensive, belonging to the category of gold and silver jewelry.

Where have ordinary people seen such a thing, only Jiu'er can see what this thing is.

If it is simple Liuli, Jiu'er is not too surprised, and she has not seen Liuli.

But the glass in Qin Qi'er's hand is different, generally the glass is colored, and I have never seen such a transparent glass.

In terms of value alone, Jiu'er thinks that the glass she has seen before is not as good as this transparent glass.

And you must know that with your own identity, the glass you have seen will be inferior to a piece of glass in the hands of others.

What kind of value such glass will be, even I can't say.

Pei Yun: "This thing is not called glass, its name is glass, these two are different, but this is not a topic to discuss, what is to be discussed is how to rely on it to ignite the grass." ”

Yes, in Qin Qi'er's hand is a piece of glass,

As for the origin of this piece of glass, Pei Yun asked someone to do it.

Pei Yun needs glass, which has a variety of uses and will come in handy in many places.

Daqin doesn't have glass, so Pei Yun can only let people do it himself.

It's not hard to make glass.

What is the material needed to make glass.

The answer is sand.

But know that the melting point of sand is around 1,700 degrees Celsius.

The ideal temperature of the kiln used to make porcelain in Nanshan Village is only about 1,600 degrees Celsius, and if it is really at such a temperature, the kiln will be abandoned.

However, there is no way to do this, and there is one thing that can lower the melting point of fired glass.

Such a thing is called potassium carbonate.

To obtain potassium carbonate, you only need to soak the plant ash in cold water, then filter it repeatedly with a filter cloth, and then boil it dry like boiling salt, you can obtain potassium carbonate.

Glass-firing kilns are available in Nanshan Village.

As long as the raw material sand and auxiliary material potassium carbonate are ready, you can start work.

Doing glass things, Pei Yun let people do it early in the morning.

It was only in recent days that it really worked.

However, it is only the initial stage of success, and large-scale production cannot be achieved.

As for why a piece of glass can set the grass on fire.

This is based on the principle of a convex lens.

When a beam of sunlight passes through the convex lens, it concentrates the sunlight into a small spot, which has a very high temperature and can ignite quickly if it falls on a flammable object.