Chapter 21 I am worse than a child?

Of course Zhao Yi was happy to have his scumbag father attend his lectures.

After all, the scumbag dad wanted to rebel and become emperor.

It would be better to listen to your own classes to broaden your horizons.

Ying Zheng looked at Zhao Yi, who was only half his height, and was teaching on the podium, while all the students below were older than Zhao Yi.

As expected, Zhao Yi is special.

Everyone else in the village needs him to teach.

Is he really an immortal?

Suddenly, Ying Zheng noticed that the characters Zhao Yi wrote on the blackboard were completely different from the official characters of the Qin Dynasty, Xiaozhuan.

Does he really want to rebel so much?
You should know that among the decrees issued by Ying Zheng after unifying the Central Plains, there are three that are the most important.

The same track for vehicles, the same writing for books, and the same measurement.

As a result, Zhao Yi created his own font for teaching.

This is too simple!

Suddenly Ying Zheng realized the characteristics of Zhao Yi's handwriting.

Ying Zheng could find many small seal characters in the handwriting of Zhao Yi.

But Zhao Yi's handwriting is simpler than small seal script.

This means that learning Zhao Yi's font is less difficult than learning Xiaozhuan.

The time taken to learn it is also shorter than that of Xiaozhuan.

Ying Zheng picked up the pen beside him and prepared to dip it in ink to write down the simplified Chinese characters written by Zhao Yi on the notebook.

Ok?
I have never seen this pen before!

Ying Zheng suddenly discovered that the pen Zhao Yi gave him was completely different from the usual brush.

The pen is a wooden stick with a black core in the middle.

Ying Zheng tried to write and draw on the notebook with a pencil.

Found it difficult to write.

So he turned around and looked at the students beside him.

Then I realized that my posture was wrong.

He found it better if he imitated the posture of the student next to him.

Then Ying Zheng discovered the advantages of this pen.

It requires no ink!
This is very convenient!

You should know that when writing with an ordinary brush, you need to grind the ink block and then add water to make the ink before you can write.

And this pen can be written anytime and anywhere.

This can be used by scout guards so that they don't need to carry ink with them.

Another advantage of this brush is that you don't need to wait for the words to dry after writing like you do with a brush.

Ying Zheng touched the tip of the pen.

It turns out that the refill is carbon.

Ying Zheng planned to go back and have someone imitate and make pencils.

This pencil is quite suitable for marking memorials.

After Zhao Yi finished writing on the blackboard, he began to lecture.

Although he is teaching a science class today.

But before that, he had to review the nine-times-nine multiplication formula and the system of linear equations with two variables taught in the previous class.

So Zhao Yi just wrote a few multiplication table problems on the blackboard and started reading them.

Ying Zheng felt a little disappointed when he heard it was a multiplication formula.

Daqin has this 99% multiplication method.

Almost all officials of the Qin Dynasty knew the multiplication formulas.

Because all Qin officials needed to learn arithmetic.

After all, many things in administration, such as land measurement and various types of taxes, require arithmetic.

"Now we have finished reviewing the multiplication tables. Next we are going to review the linear equations with two variables."

"I have written a question on the blackboard now."

"There are chickens and rabbits in a cage. If you count the heads in the cage, there are thirty-five heads, and if you count the legs, there are ninety-four legs. So the question is, how many chickens and rabbits are there in the cage?"

"Everyone can do the calculations now. I will announce the answers in five minutes."

Now Ying Zheng was confused.

What does this teach?

What the hell is this question!
Ying Zheng racked his brains for a long time but couldn't figure out how to calculate the chicken and the rabbit.

Could it be that all those students could do this kind of questions? Ying Zheng glanced around.

I found that the children were writing and calculating on papers.

No!
Do they all know this kind of question?
Doesn't this mean that I'm not even as good as a child?
In fact, there is no need to blame Ying Zheng.

Because the earliest arithmetic book involving two-variable linear equations is the "Nine Chapters on the Mathematical Art" in the Western Han Dynasty.

The chicken-and-rabbit-in-the-same-cage problem that Zhao Yi mentioned comes from the mathematical work "Sun Zi Suanjing" from the fourth or fifth century.

Five minutes later, Zhao Yi announced the answer.

"The answer is: there are twenty-three chickens and twelve rabbits."

"Please raise your hands if you got it right."

Swish swish!
Almost three quarters of the students in the class raised their hands.

Ying Zheng couldn't believe it.

Three quarters of people know how to answer this question?

This means that three quarters of these children have better arithmetic skills than the officials of the Qin Dynasty!
Is this the child from Shahe Village?

"Okay, this means most people know how to solve linear equations with two variables. If you still don't know how to solve them, you can ask students who have already learned how to solve them."

"Next, let's move on to today's new science lesson."

The students below became excited when they heard this.

Science class?
What class is this?

Upon hearing the unfamiliar words, Ying Zheng and the other man became interested.

Because once Zhao Yi says an unfamiliar word, it means there is something good.

Zhao Yi erased the words on the blackboard and drew a big circle and a small circle again.

"The sun is something we see every day. Have you ever wondered why the sun is smaller at noon and larger in the early morning and evening?"

"Today the teacher will tell you the reason."

Ying Zheng heard it.

Isn’t this the story of the two children arguing about the sun written by Lie Zi, one of the Ten Great Heroes of the Pre-Qin Dynasty?
Ying Zheng had naturally heard this story.

Does Zhao Yi understand why the sun is sometimes bigger and sometimes smaller?
Zhao Yi smiled and said, "The reason is very simple. Because the earth beneath our feet is a ball just like the sun."

As soon as Zhao Yi said this, the students below began to talk about it.

"The ground under our feet is clearly flat, how could it be a ball?"

"That's it."

"Teacher, you are not wrong. The earth is flat, how can it be a sphere?"

"If the earth were a ball, we would have slid away long ago."

If someone said that the earth is a ball, then Ying Zheng and Wang Jian would definitely think that person was talking nonsense.

Because there was only one theory about the heaven, earth and universe during the Qin Dynasty.

That is the Gaitian Theory - square belongs to the earth, circle belongs to the sky, the sky is round and the square is square.

And the advanced ones later on - the sky is like a covering hat, and the earth is like a covering plate.

Both of these views are recorded in the Zhoubi Suanjing, a book written during the Warring States Period.
But it would be different if the person speaking was Zhao Yi.

Because Zhao Yi brought them so many new things in the past few days.

They couldn't help but believe what Zhao Yi said.

Since there are potatoes that produce 3,500 kilograms per mu, there are grenades that are as powerful as thunderbolts.

So why can't there be a possibility that the earth is a sphere?

"Let me give you an example, a boat in a river."

"When we see a ship, we see the mast first and then the hull."

"And that's because the earth is a big ball, and the ball has a curvature."

"If the earth was flat, we should be able to see the hull directly," Zhao Yi explained.

However, the students below did not fully accept the fact that the earth is a sphere.

"Impossible. If the earth is a sphere, why is there an ocean?"

"Yeah, if it was a ball, the water would have flowed away long ago."

Zhao Yi continued, "It's very simple, because the earth is so big that its gravity sucks us in and won't let us go."

"Let me give you another example - the moon."

"The reason why the moon waxes and wanes is because our land blocks the moon's light."

Ying Zheng and Wang Jian were shocked by Zhao Yi's remarks.

Does the moon change at night because the earth blocks the light?

……

(End of this chapter)