"If you want Datang to become like that in advance, there is only one way."

Li Chong said as he took out the binoculars from his arms and handed them to Li Er.

Li Er unconsciously took it.

"What is this?" he asked. ”

"Technology."

"Uh...... Telescope. ”

Li Zhong corrected later.

Li Er took the binoculars, looked left and right, and his eyes were full of doubts.

Li Zhong then told him how to use it.

Only then did Li Er know the role of this thing.

"This thing can be used to sail on the sea and see farther away."

"Of course, it can also be used for observation on land."

"It's a military reconnaissance method."

Li Er had never seen such a thing, and he kept fiddling.

"With this thing, soldiers don't have to get so close when they are scouting, and naturally, it won't be so dangerous."

At this time, Li Er also raised the question that everyone would have, and asked, "Why are all the things you see here upside down?" ”

Li Chong analyzed the reason for him: "Maybe it's focal length?" I don't know the specific reason. ”

"What does focal length mean?"

"You don't understand."

But Li Er still looked at him.

Li Zhong had no choice but to squat down, break a branch, and draw on the ground.

After Li Chong's explanation, Li Er finally understood something.

However, Li Chong himself was trapped in it.

You say, "Why is it upside down?"

This made Li Chong very puzzled.

After some tossing, Li Zhong finally understood.

Theoretically, two convex lenses can indeed see a positive image, but the human eye generally looks at the lens, and if you can see it outside the focal length of the second convex lens, then the image will become a positive image again.

Lee was pleasantly surprised by what he found.

Li Er saw it in a fog.

"Then the question is, how did those telescopes in later generations be able to see the positive image when they were close to the lenses?"

Li Zhong looked at Li Er while thinking.

Li Er also lowered his head and looked at him with silence on his face.

Then Li Chong said: "But this thing, take it to see the moon or something, it's more than enough." If Your Majesty is free, you can take it to see the moon with the queen in the evening. Anyway, I've seen it with the prince. ”

Speaking of the crown prince.

Li Er has also felt more and more recently, the prince's temperament has become very good.

"Do you still think that the prince can't be the majesty of the Tang Dynasty?"

Li Zhong dropped the branch and clapped his hands.

'With me, it's a dog, and it can be the majesty of the Tang Dynasty. ’

But Li Zhong can't say that.

Otherwise, he was afraid that Li Er would be angry and punish him.

Kill him, Li Er shouldn't be.

But this bullying, Li Er will never get used to him.

What he said before that Li Chengqian is not suitable to be the majesty of the Tang Dynasty is based on the fact that Li Chengqian, who has not been interfered with by anyone and has developed and deduced it completely in accordance with the history books.

Today's Li Chengqian, Li Chong can only say: "Now, half of it is suitable." ”

Li Er came to be interested.

"What about the other half?"

Li Chonghui said that the other half is me.

Only when he and Li Chengqian are combined, that is the most perfect.

But if he said so, Li Er would feel that you wouldn't develop into a powerful minister in the future, right?

Before I die, I will pull you on your back.

Although, in fact, Li Chong is not afraid at all, after all, when Li Er is about to die, he is estimated to be forty or fifty years old, and he has earned another twenty years, so what is not satisfied.

Then he said: "The other half...... The prince's heart is not stable enough. ”

Li Er felt noncommittal.

"In the future, I need you to teach him more."

"Since he can call me a teacher, of course I will teach him seriously and responsibly. I have a way to make Datang get better soon. ”

Li Er looked at him.

"It's too good to be fine."

"It can only be said that if you want Datang to get better quickly, it must develop science and technology. After all...... As the saying goes, technology changes life. Li Chongdao.

"Then why didn't you say it earlier." Li Er said.

"I didn't say it before, it was because I wasn't ready in my heart. Moreover, you can't be delusional, it will get better soon, I said, and the good ones are limited. But at least, it's a step forward. I propose that a new Academy of Sciences be established outside the three provinces, and this president, that is, I, will be given the treatment of three products. ”

There was no need for Li Chong to continue, Li Er knew what Li Chong wanted to do.

He went for the treatment of these three products.

"You're short on money?"

"Who is not lacking."

"But you directly ask for a three-grade one, if other people know, they will definitely not accept it."

"Just press it. Moreover, as the prince's teacher, I haven't received a salary yet. ”

"Then you didn't do what a bachelor should do."

"That said, I serve as an advisor from time to time, and you can't treat this as if it didn't happen."

"What is the role of your academy?" Li Er asked again.

"Developing science and technology."

"What is technology?"

"It's like saying this, before the Three Emperors and Five Emperors, you could only use wood and stone, when the Three Emperors and Five Emperors were the time, you began to be able to use bronze, and after the Spring and Autumn Period and the Warring States Period, you could use iron, this is technology."

"That is, in the future, there will be better than iron?"

"That's not the case."

Seeing Li Er looking at him deadly, Li Chong said, "So, the good ones are also limited." But not in vain, it will definitely help. If it weren't for the fact that the officials of the Tang Dynasty couldn't do business, I would have gone into business a long time ago. I still need to ask you for an official here. By the way, the production method of my tofu can be taught to the people of Chang'an, this mutton people can't afford to eat, and it's not bad to eat tofu. The value of this tofu is comparable to that of mutton. The key is that it's also cheap. ”

Li Er also thinks that this thing is delicious, especially the fish soup stewed, which is extremely delicious.

"Accurate!"

"You mean my dean, or tofu."

Li Er didn't bother to answer him.

I walked forward alone.

Li Zhong did not follow.

Because there is a saying, he doesn't know whether to say it or not.

As a traverser, the last thing he should do is to show how capable he is in front of Li Er, so a situation like today is actually the most unacceptable.

However, Li Chong still fantasized that Li Er was at least a good person, and he never killed heroes.

Unlike Lao Zhu, if it was Lao Zhu, Li Chong would definitely not dare to expose himself.

All I can say is......

It's still my own problem.

After all, he is too greedy for money.

But if you can't live a better life, then what's the point.

Can't I enjoy it anymore?

Li Er saw that he didn't follow, so he also turned his head to look at him.

Li Chong said: "I promised to enjoy the autumn scenery with the prince, if there is nothing else, the minister will retire first." ”

“……”

Outside.

Li Chengqian kicked the stones alone.

It seems that it will not work today.

Until he saw the teacher's shoes.

And the incense that came from the teacher's body.

"Let's go! Lead the way! ”

"Teacher, don't you have something to discuss with your father?"

"There's something to do, it's not much, it's over in three or two sentences."

By the way, Li Chong also wants to see what the prince's life is like under the primitive ecology.

So......

By the way, Li Chong also visited Li Chengqian's residence in the East Palace.

In the future, I may be able to write a paper that will be passed down through the ages.

For example, how long and wide it is, how well it is arranged, how many steps, and what there are, in fact, it is not very big.