The most arrogant in history

Chapter 422 Xiao Ruliu’s request.

The city of Jinling has changed a lot.

Most of the former royal palace was cut off and converted into a university and a middle school.

The palace used to have two huge granaries, which were converted into office buildings and government offices.

Only the inner halls and rooms of the palace were left in their original state, and people were sent to guard and clean them so that Ye Kun could come and live there occasionally.

Ye Kun first took Xiao Ruliu to visit a university.

Teachers and students are having class.

When they saw Ye Kun, they all stood up.

Ye Kun clasped his fists and said, "No need to be polite, everyone. Let's continue with the class. I'll come and take a look and be a student in the back as well."

Then, Ye Kun took Xiao Ruliu to sit in the last row and listen to the teacher's lecture.

This is a new-style classroom, using chalk and blackboard.

The students’ textbooks are all made of snow-white writing paper with neatly printed texts.

Today I was in the Physics class. The teacher was explaining the principles of mechanics and came to the topic of friction:

"Dear students, why are our wheels designed to be round? That's because round wheels are easy to roll, have the least friction, and save the most effort. We add lubricating oil to the wheel bearings to reduce friction.

Let's do an experiment so you can see the difference in friction. "

It was the first time that Xiao Ruliu heard such knowledge and was very interested. She opened her eyes wide and pricked up her ears, afraid of missing a single word.

The experiment is very simple.

In the first experiment, a rough wooden board, about the size of a tabletop, was placed flat on the ground. Two people squatted on it and one classmate pulled the board with a rope.

Such pulling and pulling is naturally very strenuous.

In the second test, two longitudinal wooden strips were added under the board, which greatly reduced the contact surface.

It is much easier to pull the same weight.

In the third test, lubricating oil was added to the wooden strip under the board, and pulling it was effortless.

During the experiment explanation, the teacher asked, "Students, after watching the experiment, do you have a concrete understanding of friction?"

Xiao Ruliu suddenly stood up and asked, "Sir, we can infer this kind of experiment based on our life experience, but what does it prove? I still can't see where this friction is."

The teacher looked at Ye Kun and didn't dare to speak.

Ye Kun bowed and said, "This is the teacher's class, please speak freely."

The teacher nodded, took two books, turned them over, and clamped the pages alternately, then laid them flat on the table, pressed them down lightly with a box of chalk, and said to Xiao Ruliu:

"Student, let's do another experiment. We put these two books together and press them down with a chalk box. I bet that even two strong men can't pull these two books apart."

Xiao Ruliu certainly didn't believe it, and said with a smile: "Sir, can I try it myself?"

The teacher nodded: "Of course."

Xiao Ruliu was very interested and invited Ye Kun to go up and do the experiment together.

Ye Kun had no choice but to cooperate.

The pages of the two books were stuck together, and Xiao Ruliu couldn't pull them apart no matter how hard she tried.

After a while, Xiao Ruliu loosened his hand, clasped his fists and said to the teacher with a smile: "Sir, now I understand the force of friction."

The teacher returned the greeting with a fist, and then said to the students: "Dear students, our textbooks were all written and approved by Principal Ye. Since Principal Ye is here today, please ask him to say a few words to everyone, okay?"

"it is good!"

The students applauded together.

"Thank you, students."

Ye Kun nodded, stood on the podium, flipped through the textbook, and continued: "Our next lesson is about the specific gravity of substances, so I'll just talk about it casually."

The students are full of expectations.

Xiao Ruliu also looked at Ye Kun with interest.

Ye Kun said:

"Every substance has weight, including the air we breathe. We can compare the unit weight of a substance to that of water and call it specific gravity.

Once we learn this, we can test the purity of gold, silver and all metals. It can also be used in other industries, such as shipbuilding..."

While giving a lecture, Ye Kun also conducted experiments and led his classmates to complete a density test of a gold cake.

Xiao Ruliu just thought it was fun, but couldn't understand it at all.

Those calculation formulas were like incomprehensible books to her.

Because she has never learned Arabic numerals!

After the class, Ye Kun took Xiao Ruliu to continue visiting Jinling University.

Xiao Ruliu sighed:

"Brother Han Wang, I feel so stupid. Why can't I understand anything you are saying? I also read books when I was a kid."

"Miss Xiao is extremely smart, how can she be stupid?"

Ye Kun smiled: "It's just that the books you read before were all poems and essays, or the works of various philosophers, which talked about the principles of life and the strategy of governing a country. But our current university talks about the pursuit of knowledge through investigation of things, and talks about practical skills for life. In addition, we have created some digital symbols, so it's normal that you don't understand them."

Xiao Ruliu nodded and asked, "How useful is it to study the study of things and acquire knowledge?"

"That would be very useful."

Ye Kun pointed to the sky and said, "From a broader perspective, if you study the way of the study of things to acquire knowledge to the end, you will fully understand the world. From a smaller perspective, it can guide us in building buildings, repairing bridges and roads, making warships, and trivial matters in life..."

"Your red sugar, white porcelain, and glass are all made by using the principle of studying things to gain knowledge?"

"Yes, the study of things to gain knowledge is the foundation of all inventions."

Ye Kun nodded and took Xiao Ruliu to see the observatory at the university and introduced her to astronomical knowledge.

Coincidentally, there would be a partial lunar eclipse two days later, which had been predicted by Jinfeng long ago.

With the current golden wind, predictions of solar and lunar eclipses are as accurate as magic, with the time being accurate to about half an hour.

It can also calculate transits of Mercury.

Xiao Ruliu was shocked: "It's impossible. How can you calculate the eclipse of the moon?"

"Actually, this is very simple. Lord Jinfeng has already calculated the solar and lunar eclipses within a hundred years."

Ye Kun adjusted the high-power telescope in the observatory and pointed it at the river: "Miss Xiao, from here, you can see the small boats on the river and the people rowing. Everything within ten miles is within your sight."

Xiao Ruliu moved closer and saw the river in the distance. He couldn't help but get excited:

"I saw the other side of the Yangtze River and the fishermen on the shore. They were laughing..."

Xiao Dequan also has telescopes now, but they are all made of transparent crystal and the effect is not very good.

After a long while, Xiao Ruliu reluctantly put down the telescope and sighed:

"No wonder we in Jiangdong can't defeat you. Your telescope can see our Jiangdong's details clearly."

Ye Kun smiled and said, "Miss Xiao, let's not talk about this anymore. Go back. I'll welcome you tonight. I'll watch the lunar eclipse with you in two days."

Xiao Ruliu nodded and walked down the observatory with Ye Kun.

During dinner, Ye Kun called Huangfu Lin and the Cherry couple to accompany him.

Yingtao smiled and said, "Miss Xiao is back in Jiangnan, so she won't leave in the future, right?"

Xiao Ruliu suddenly burst into tears, walked to Ye Kun, and bowed deeply: "King Han, I have an unwelcome request."