"No exams?" Wen Ji and Diao Chan's two daughters leaned their heads in front of Ye Hui together, not knowing what good ideas this person had in his heart.

"No, no, no, exams are dripping, and learning efficiency is also dripping." The three girls were puzzled.

It turns out that Ye Hui's brain hole suddenly came from the exam to the school classroom of later generations, and there is multimedia in the school classroom to assist learning, but multimedia is basically not thought about in this era, so what about the blackboard that retreats to the second? Isn't this thing easy to make?

Nowadays, the main reason why students always need to ask questions is that the teacher takes the book to dictate the teaching, and even the painting skills that pay the most attention to the picture are taught by the teacher, and the students need to rely on their own understanding. Therefore, as long as the students accidentally miss a little during the class, it will be difficult to keep up with the progress, and it is always difficult to disturb the neighbors on the side, and it is not good that both of them will lose their progress.

So the solution comes out, wouldn't it be nice to add a blackboard! The teacher writes and draws on the blackboard in class, and the students can know the approximate progress at a glance, and they also have time to copy down and take back the things they have said to review.

In this way, writing a blackboard book will solve the substantive problem!

Ye Hui only felt that he was worthy of being a genius.

"Your genius lies not in inventing things, but in plagiarizing other people's inventions!" Xiaoxiao said disdainfully.

"I don't care so much, these things are conducive to the development of my academy, and there is no way to do it." Ye Hui smiled and continued: "Look at Wen Ji, look at other gentlemen, look at me, I have been dizzy recently because of the students' studiousness, how bad this is, gentlemen are going to be passive and slacking off." And now that a small blackboard can solve a lot of problems, why not? ”

"Then let it be, I can't handle it so wide." Xiaoxiao said helplessly.

Seeing that Ye Hui said a "yes and no", there was no follow-up, and he began to be in a daze, and the three girls were a little anxious, what kind of deal did this person sell! It's disgusting.

Diao Chan is the most qualified to teach Ye Hui a lesson, pretending to be angry, his little hand gently tugged at Ye Hui's ear and said: "Sir, if you pretend like this, the slave family doesn't want to be nice to you." ”

"What! Never! Never! It's not that I'm playing tricks, I'm just skimming through my head and thinking about the feasibility of the plan. As soon as Ye Hui heard Diao Chan say this, he was immediately afraid.

"Is it possible?" Diao Chan let go of Ye Hui's ears, because Ye Hui was deflated, and said with a smile.

"It's doable, it's doable. We're almost done with our meal, and I'll show you how. ”

When the three girls heard this, they immediately didn't care about the image and began to gobble up, and Ye Hui realized that there were all foodies around her!

After a storm, Shang Xiang complained that the meat was a little old today, and he might have indigestion if he swallowed it without chewing it properly. Wen regretted not eating xiaolongbao, which is a pity. Diao Chan regretted ordering too much spicy food and was worried about whether she would have acne tomorrow.

Ye Hui walked in front and heard a burst of complaints behind him, and said with black lines on his head: "A few aunts and grandmothers, we are going to study academic things, I hope you can be a little more serious." ”

"Received, received. Will pay attention. The three girls smirked.

After walking for a while, Ye Hui picked up a flat stone and led the three girls to the study together.

After arriving at the study, Ye Hui asked Wen Ji to study ink, and asked Shang Xiang to find a wax block, and he sat on the chair and hooked his hand to let Diao Chan massage him, but it was not chic.

The third daughter took Ye Hui's method, so she had to do it obediently.

After Qi lived, Ye Hui carefully dyed the stone with a thin layer of ink, making it turn black. After the ink dried, the wax block was gently carved on it, and white marks appeared.

The third daughter is naturally not stupid.

"Sir! I see, just make an enlarged version of this, and you can use it in class! Wen Ji was the first to speak.

Diao Chan and Shang Xiang were robbed, but they were not angry, but only said that Wen Ji was really talented and intelligent.

"Yes, that's what Mr. thinks, what do you think!" Ye Hui is naturally triumphant.

"It's so natural and wonderful! It was so simple to solve the current huge problem, Mr. Shuijing! Diao Chan did not hesitate to praise herself.

"Yes, Sir always finds an easy way to solve a problem." Wen Ji laughed.

"Little ones......" Shang Xiang muttered quietly, obviously dissatisfied with Ye Hui's smugness.

"What did Xiang'er say?" Ye Hui asked.

"No, nothing. So that's going to start tomorrow? Shang Xiang didn't know that Ye Hui heard some noises, and hurriedly made a fuss.

"That's what I planned, naturally." Ye Hui nodded.

With Diao Chan, after the two returned to the bedroom to wash and go to bed, Ye Hui lay down but did not feel the slightest sleep.

What is the best material for this blackboard? Surely can not simply use stone, ink and wax blocks, so that can only record and is inconvenient to repeat the record, the blackboard of later generations has stone and iron, these two materials are relatively backward now from the material, production has a certain degree of difficulty, even if the difficulty is overcome, it will consume huge manpower and time, not very appropriate.

There is also writing material, although wax is soft and easy to write, it is also too easy to melt, and it is difficult to remove after sticking to the object, which is not appropriate. I just asked Xiaoxiao and learned that the main materials of chalk are limestone and gypsum, which are very easy to obtain and can be replaced with chalk. Chalk is a simple and easy limestone, so there are alternatives to chalk.

It seems that the blackboard should still be made of wood, planed and smoothed the surface of the board, and then slightly sanded to create a frosted feeling, so that the chalk is easy to write on it.

Ye Hui, who had a general idea in his heart, was extremely happy, and fell asleep with Diao Chan in his arms.

The next day, Ye Hui hurriedly began to contact the group of people who had helped with movable type printing before.

After gathering a vote of people, Ye Hui slowly discussed his inner thoughts with everyone.

After some conversations, everyone was impressed by Ye Hui's simple but ingenious creativity.

Yes, everyone understands the truth, the principle is very simple, everyone wants to get it. Since ancient times, it has been the experience of using blackened charcoal to write on stone tablets, but writing on a large board and introducing it into teaching is something that only a talented person can connect the two.

"Mr. Shuijing's favor, I must help!"

"Mr. Shui Jing has made so many contributions to our Yuzhou, and now it is for the younger generation, it is simply unreasonable not to help."

Not to mention, a group of people discussed what kind of wood and paint to use as the raw materials for the blackboard, and then led a group of people to mine chalk in the fault rock layer on the mountain, and this "blackboard plan" began in full swing.