"I went to school and the teacher didn't know."

"Love learning, love labor, and make meritorious contributions to the people when you grow up."

When he came home from school that day, Yang Xinxin was happy and sang a little song.

Yang Tongtong looked at Yang Xinxin with a puzzled expression, what the hell is this singing?

Yang Tongtong asked, "What are you singing?" ”

Yang Xinxin replied: "Our teacher taught us songs! ”

Yang Tongtong said, "Did you sing it wrong?" ”

Yang Xinxin sang it again and said, "It's not wrong, that's how it was sung." ”

Yang Tongtong rolled his eyes and said, "Shouldn't it be that I go to school and not be late every day?" ”

Yang Xinxin responded indifferently: "You say yes, right!" ”

Yang Tongtong is helpless, what do I mean by saying yes, shouldn't I say I'm right?

However, Yang Tongtong was not in the mood to argue with Yang Xinxin, he was more curious, why was Yang Xinxin so happy?

Yang Tongtong asked, "Yang Xinxin, why are you happy today?" ”

Yang Xinxin replied; "Hee-hee, today we took the math exam, I took the first place in the class, and the teacher rewarded me with a notebook."

Yang Tongtong asked, "Then can you show me?" ”

Yang Xinxin nodded, but she promised to show her brother when she went home.

After returning home, Yang Xinxin took out a beautiful notebook from his schoolbag, and there were many small flower patterns on each page.

Yang Tongtong was a little envious, so he deliberately asked: "Xinxin, do you know where the original paper came from?" ”

Yang Xinxin replied: "Of course I know, the original paper was invented by Cai Lun. Papermaking, printing, gunpowder, and compass are the four major inventions in the history of our country. ”

Yang Xin looked at Yang Tongtong proudly, wanting to test himself, he was no longer a six-year-old child, he was already six and a half years old.

Yang Tongtong didn't expect that he didn't get his sister, it is worthy of you, Yang Xinxin, you know a lot.

After Xiao Luomo heard it next to him, he corrected: "The paper of your planet was not invented by Cai Lun, but Cai Lun improved the papermaking technique. ”

Yang Xinxin sighed, wasn't it invented by Cai Lun?

Xiao Luomo saw Yang Xinxin and Yang Tongtong looking at him, so he said: "Lord Ben will be merciful and take you to see how Cai Lun improved papermaking skills!" Meow! ”

didn't wait for Yang Xinxin and Yang Tongtong to disagree, Xiao Luomo had already teleported them to the Eastern Han Dynasty.

After Yang Tongtong and Yang Xinxin landed, they found themselves outside a big mansion.

This house says Cai Mansion, it should be Cai Lun's home.

At this moment, the door of Cai's mansion was open, Yang Tongtong and Yang Xinxin cautiously walked into the house, and found that there were many large water tanks in the house, which were all some shabby fishing nets and clothes.

Although Yang Xinxin and Yang Tongtong knew that papermaking was improved by Cai Lun, they didn't know how paper was made, so they were very strange when they saw these things.

Yang Xinxin looked at Yang Tongtong and asked, "Brother, why did you say that Mr. Cai Lun collected so many tattered clothes and fishing nets?" Could it be that he is picking up rags? ”

Yang Tongtong was speechless for a while, that's right, Yang Xinxin, I think so too.

When the people in the house heard a movement outside, they hurried out and saw two strangely dressed children in the courtyard.

Cai Lun looked at Yang Tongtong and Yang Xinxin curiously and asked; "Who are you?"

After Yang Tongtong politely bowed, he said: "Sir, my name is Yang Tong, and she is my sister, Yang Xin." We came from a distance, and when we passed by this place, we were a little curious to see these old fishing nets in this house, so we bothered him. ”

Yang Xinxin nodded like a chicken pecking rice, and said twice: "That's right, excuse me!" ”

Then Yang Xinxin whispered to Yang Tongtong: "Brother, why do you talk in a crepe?"

Yang Tongtong rolled his eyes, what is called his own crepe, is it good to be polite.

Cai Lun didn't care when he saw that it was two children.

After all, a pair of little brothers and sisters, what bad intentions can they have!

Cai Lun introduced Yang Tongtong and Yang Xinxin: "My worn-out fishing nets are all used to make paper, and I hope that cheap materials can be used to make more beautiful paper, and then many people can use it." ”

However, Cai Lun quickly sighed and said: "But although my idea is good, it can't be successful, I really can't understand which step I did wrong, resulting in the paper that I made, which is very inapplicable, and it is difficult for the brush to write smooth words on it." ”

Yang Xinxin asked, "What was the paper made of before?" ”

Cai Lun replied: "Most of the previous paper was made of secondary cocoons, repeatedly beaten, and then mashed into pulp, and degummed with lime water or grass ash water for silk and linen. However, the cost is too large, and only dignitaries can use it, and ordinary people will be very happy if they can use a stack of paper. I tried to make paper from improvised materials, but failed. ”

Yang Tongtong also asked at the right time: "Sir, I don't know how you did it, can you tell us about it?" Maybe my sister and I can help you figure it out. ”

Cai Lun was a little stunned, then smiled, and told Yang Tongtong and Yang Xinxin.

After all, he wants to improve the current paper, not to make a profit, but to make it affordable for more people.

Cai Lun said: "The raw materials I use now, such as hemp heads, cloth and fishing nets, these materials can be found everywhere, and they are nothing, but they have a big problem, that is, they can't be degummed. If there is no way to degum, the paper will melt and have no stickiness. ”

Yang Tongtong fell into contemplation, Yang Xinxin also fell into contemplation, they didn't know what was missing, they could only focus on Xiao Luomo in the corner.

Cai Lun was strange, he naturally recognized cats, but did he need cats for papermaking?

Xiao Luomo meowed, he naturally knew what was wrong, but when he thought that Yang Xinxin was always holding the back of his neck, it was a little uncomfortable.

Yang Xinxin ran over and picked up Xiao Luomo, Xiao Luomo wanted to resist, but as soon as he smoothed it, it called comfortably.

Forget it, forget it, there are a lot of them, so I don't care about them.

Xiao Luomo secretly told Yang Tongtong about the missing materials, why didn't he tell Yang Xinxin, Yang Xinxin is really unreliable, although Yang Tongtong is only seven years old, he is already very mature.

After listening to this, Yang Xinxin nodded and said to Cai Lun: "Sir, since you have already used hemp heads, cloth, fishing nets and other raw materials, why don't you put some mashed bark into it?" ”

"Bark?"

Cai Lun's eyes suddenly lit up, yes, bark, why didn't he think of it!

Cai Lun didn't have time to say anything to Yang Tongtong and Yang Xinxin, so he immediately ran out.