Lu Heng was spitting in the study.

"This Arabic numeral will be much easier to calculate than before."

"As long as you learn and get used to this text, I promise that you will be able to add, subtract, multiply and divide everything in the future."

"If I have the opportunity in the future, I still want to improve the current characters, traditional Chinese is a bit complicated, if you want to vigorously eradicate illiteracy, I guess you still have to look at the simplified Chinese ......"

Now he only hates that he doesn't have a blackboard in his hand, so he can only use that piece of rice paper to give lectures.

In front of them, Li Mingyu and Wu Zhao sat in a row, with their hands on their cheeks, listening very seriously.

Originally, Lu Heng only planned to teach Wu Zhao alone, because mathematics, physics and chemistry were obviously not Li Mingyu's interests, she wanted to study medicine, and just the inventory in Sun Simiao's old man's stomach was enough for her to learn for a lifetime.

But it can't be helped.

After Li Mingyu listened for a while, he made a fuss about learning together.

While Lu Heng was lecturing, he pondered in his heart-

He did have the idea to gradually replace traditional Chinese characters with simplified characters.

In the era I lived in, there must be a reason why I changed the traditional Chinese to the simplified Chinese.

The promotion of Simplified Chinese is necessary for mass literacy. Even if Lu Heng is a highly educated talent in modern times, he can only understand traditional Chinese, and he can't write it casually like the ancients.

Of course, it is not difficult to learn, but in fact, Lu Heng wants to directly promote simplified characters.

There is still a long way to go.

Just like movable type printing, the abolition of the line scroll and the public recommendation system, changing the traditional Chinese to the simplified Chinese has also greatly improved the literacy speed of ordinary people, and it can be quickly learned and used in daily life without long hours of study.

If the reform of the imperial examination was to weaken the family and allow more children from poor families to enter the ranks, then the promotion of simplified Chinese literacy was to pass on the experience of many craftsmen today.

Lu Heng is not so arrogant.

Although he is a time-traveler, how many lost crafts have been lost throughout the ages?

These things were lost, partly because the craftsmen were afraid that the apprentices of the church would starve to death of their masters, so they hid them and left many of the skills at the bottom of the box until the last minute to teach.

But more importantly, because many craftsmen do not have a high level of education, their experience cannot be recorded in writing, and the probability of being lost is even greater if it is passed on by word of mouth.

Lu Heng pondered and pondered, and forgot to lecture for a while.

"Sir, sir?"

Wu Zhao tentatively shouted twice, only then did he wake him up from his fugue.

He was a little embarrassed and said:

"Sorry, I thought of something else."

Li Mingyu, who had been listening quietly, had a thoughtful light in his eyes-

Could it be that his husband came up with any ideas?

Li Mingyu said excitedly:

"What do you think?"

Lu Heng scratched his head, and was about to tell her about the benefits of simplified Chinese characters.

But there was a sudden knock on the door.

He frowned and asked:

"Who?"

A vicissitudes of life and a familiar voice came from outside the door:

"Old man, me!"

Lu Hengda was shocked.

How did you recruit Old Man Sun!

He hurried over to open the door.

"Old man, what are you doing here?"

Sun Simiao touched his beard at the door and said slowly:

"I heard that your kid was secretly teaching behind the old man's back, so I came here to take a look."

"What have you taught, let the old man listen to it too!"

Lu Heng was shocked.

He looked out of the door in disbelief, looked through the porch, and saw Lu Tongren's embarrassed but polite smile on his face in the courtyard.

Really......

It's my father who sold me again!!

He withdrew his gaze and said:

"Old man, I'm not teaching medical skills here, so it's useless for you to listen to it......"

Sun Simiao ruthlessly interrupted:

"Listen and it's fine!"

"Or do you want to hide your secrets?"

"The old man has taught Yu'er everything he has learned in Bisheng, your lady has learned so much from me, if you still want the old man to teach her in the future, don't be so stingy!"

Lu Heng's face turned green.

It's not that he doesn't want to teach the old man.

However, it is common knowledge that the ability of older people to learn new things is much weaker than that of younger people.

Even if Sun Simiao is different from ordinary old men and is willing to accept his medical theories that seem a little deviant today, this does not mean that he can accept Arabic numerals, right?

Lu Heng said quietly:

"Old man, it's okay if you want to learn, but you have to promise me that you won't be able to talk and interrupt my lecture later."

"After all, it's not just you."

"Can you agree to this request?"

Seeing that Lu Heng was willing to teach himself, although he didn't know what to learn yet, Sun Simiao was already very satisfied.

He hurriedly nodded again and again:

"Naturally!"

"Okay, okay, let's stop talking about that, let's get started!"

Lu Heng sighed helplessly, and found a place next to him for the old man to sit down.

Immediately, he resumed his lecture.

Fortunately, I only gave a brief lecture to Wu Zhao and Li Mingyu just now, and it hasn't officially started yet, so it's not a waste of time to start from scratch now, and it can also consolidate what they have learned before.

“…… The advantage of Arabic numerals is that the strokes are simple, and using them to do a lot of calculations can save a lot of time. ”

"For example, the ordinary one, is it much easier to use than this 1?"

"Of course, we can usually use Arabic numerals for scientific calculations, but if it is an account book, it is better to use one or two or three squares, and it is not easy to be tampered with by someone with a heart."

As soon as he said this, Sun Simiao at the bottom couldn't wait to ask.

"Why is this number called Arabic?"

Lu Heng choked up.

Of course, he couldn't say because it was called Arabic numerals when he learned it.

Now, Arabia doesn't know where he is still jumping, where can he find excuses?

"Old man, did I just say that you can't interrupt my class?"

Lu Heng's face darkened:

"If you want that, I won't teach it!"

Sun Simiao shut his mouth suddenly.

It's not that he's afraid of Lu Heng.

Mainly, the old man has always adhered to the spirit of living to learn from the old, and no matter where he learns new things, he is happy to listen to more.

Especially the person who gave the lecture was still Lu Heng, a kid.

Maybe this knowledge can be used in medicine?

In a way, Sun Simiao did not guess wrong. In later generations, only science students could take the medical school exam, and it was even more difficult for liberal arts students to study medicine.

Without Sun Simiao's halfway interruption, Lu Heng spoke much more comfortably.

He was full of enthusiasm and finished explaining the basic knowledge of elementary school in one breath, and then discovered a problem.

The three students in front of him......

The speed of mastering knowledge points seems to be a bit ridiculously fast, right?

"What the hell am I ...... Picked up three genius science students in one go?! ”