After the banquet, Cao Tong left Yuchun Building with a faint drunkenness in the escort of the general, Yang Zheng had not seen Cao Min for a long time, seeing Cao Min's charming eyes like silk, of course he would not miss the beautiful scenery of this good day, and he did not fall asleep until midnight on Cao Min's embroidery bed.

In the past two days, because of the plan, I forgot to sleep and eat, and I seriously lacked sleep, and I slept until sunset, and when I woke up, I found that there was no beauty on the bed, and I was about to pull the quilt and sit up, Cao Min walked in with a wooden basin.

Cao Min, who was plain-faced, was wearing a silk dress that was already at home, her slender figure was undoubtedly revealed under the smooth fabric, and there was a trace of spring love on her delicate face, which made Yang Zheng's heart move.

"Yang Lang, you're awake, get up and wash your face, I asked them to prepare dinner in the front hall, it's going to be cold in a while!"

Cao Min walked to the edge of the bed and sat down, and said softly to Yang Zheng on the bed.

"Hehe, I'll eat Min'er first, it's not too late for you to go to dinner", Yang Zheng took Cao Min's hand and took it lightly, and Cao Min was taken into his arms.

"Yang Lang..."

Cao Min muttered shyly, and was blocked back by Yang Zheng with his mouth.

Immediately, spring light filled the entire bedroom.

Kaifeng in April was still a little cold, the food was already cold, Cao Min pretended to be calm in Qin'er's strange eyes and asked people to heat the meal, and his right hand quietly twisted Yang Zheng's waist.

Back in the evening, a refreshed Yang Zheng spent the whole night in the study to finish the final part of the plan, carefully checked it twice and found that there was nothing missing, and then dried the ink and put it in the drawer.

In the afternoon, he had to go to the Qionglin banquet, although he was a little sleepy, Yang Zheng did not go back to the bedroom to sleep, but took Ruyi to the small courtyard where Lao Zhang's family lived.

The glasses had already been made before, because he didn't know Li Xiaoman's degree, Yang Zheng asked Lao Zhang to make a few more, and Lao Zhang was packed in an inconspicuous small wooden box.

However, the telescope that Yang Zheng wanted still needed some time to complete, and the retractable lens barrel was the most difficult to make, and even the master craftsman Lao Zhang took several days to finally make the things on Yang Zheng's drawings.

Yang Zheng drew a monocular, the magnification is only eight times, because Yang Zheng is not very clear about the accurate data, he can only let Lao Zhang make a few more, which are being placed side by side on Lao Zhang's workbench at the moment.

"Elder Zhang, I'm glad to be miserable..."

Yang Zheng picked up a telescope that was about to be completed, glanced at the outside of the house, and the effect was indeed similar to the eight-fold mirror purchased online in his previous life, and said to Lao Zhang with satisfaction.

"Childe's words are serious, Childe is a pedantic celestial, and he actually came up with such a magical "clairvoyant mirror", and I am deeply honored that the old man can make them,"

The clairvoyant mirror is marked by Yang Zheng on the drawing, Lao Zhang didn't care about it at first, until he made things according to the drawings, and then he threw himself to the ground on the five-body body that Yang Zheng admired.

"Haha, I also see it in books occasionally," Yang Zheng said happily as he played with the clairvoyant mirror.

"Childe, what is this clairvoyant mirror?"

Ruyi saw Yang Zheng's eyebrows fluttering, and asked curiously.

"Now, I'll show you, to the tree by the river."

Yang Zheng pointed to a big tree dozens of meters away from the wall of Yang's mansion and said.

"I can't see it..."

Ruyi looked inside the lens barrel and said suspiciously.

"Miss Ruyi, it's the other way around, it's the other way around......"

Lao Zhang said softly to Ruyi.

Ruyi blushed, turned the lens tube upside down, and looked at the lens tube again.

"Yikes!"

When I got closer, I saw a bird with a worm in its mouth and feeding it to a bird that had just come out of its shell.

Frightened, her hand shook, and the clairing mirror fell to the ground.

Fortunately, she was fast anyway, and reacted at the moment when the clairvoyant mirror fell, copied her hand downward, caught the clairvoyant mirror, and scared Lao Zhang on the side.

Lifting the clairing mirror again, Ruyi could even see the red crown on the bird's head.

"It's amazing, Childe, how did you come up with it..."Ruyi took the clairvoyant mirror and looked left and right, and said to Yang Zheng with admiration.

"I saw it in the book, Zhang Lao, how many days will it take for these three clairvoyants to be completed?"

Yang Zheng replied to Ruyi helplessly, and turned around and asked.

"The first one is almost there, and the remaining two will be ready in two days," Lao Zhang said with certainty.

"Well, send it over, Ruyi, let's go", Yang Zheng picked up the box containing the glasses and said to Ruyi.

Ruyi couldn't put it down with the clairvoyant mirror, and reluctantly put it on the table.

"Wait until I find the right crystal, and make you a one that can see further..."Looking at Ruyi's appearance, the same as the expression of standing in front of the game console when he was a child, Yang said with a smile.

"Thank you, Childe," Ruyi said embarrassedly.

"Let's go"

The perfect urban function of Kaifeng Mansion is not only reflected in commerce, but also the service industry is extremely developed, not only has errands, express delivery business, carriages can also be hired anywhere, otherwise Yang Mansion is in the northwest of Kaifeng, Dugu Mansion is in the southeast, and you have to walk for half a day with your feet.

It took twenty dollars and half an hour to get to Dugu Mansion.

"Sister Ruyi!"

As soon as I entered the door, I heard Dugu Mei's happy voice, and then I saw Dugu Mei, who was dressed in a male warrior costume, quickly stepped forward and hugged Ruyi.

The two walked inside talking and laughing, and Yang Zheng had to follow behind with a wooden box.

"Qinghe, Ruyi, you are here"

When I walked into the backyard, I saw Dugu Xun, Li Zongming and Jia Siquan sitting at the stone table in the middle of the courtyard discussing something fiercely, and Li Xiaoman next to him listened quietly.

Seeing Yang Zheng coming in, Dugu Xun greeted in a harmonious voice.

"What are the two teachers and seniors discussing?"

Yang Zheng took a closer look, and there was a chessboard on the stone table, but there were no chess pieces on it.

"It's not that this old ghost Li has made some achievements in arithmetic and ridiculed us for not knowing how to count......"

Dugu Xun said angrily.

"Haha, Brother Dugu has wronged me, this topic is from Xiao Man, what does it matter to me..."Li Zongming said aggrievedly, with some pride and relief in his tone.

"Oh, dare to ask seniors, what is the question?"

Yang Zheng asked curiously, Dugu Xun rarely dabbled in arithmetic, but Jia Siquan still had some research on arithmetic, probably at the level of elementary school.

"Haha, Man'er, you tell Qinghe..."

"This chessboard has nineteen lines in length and width, a total of three hundred and twenty-four grids, and there are one hundred and seventy-six grids, and the vertical line is five more than the horizontal line.

Li Xiaoman said softly.

"Qinghe, just listen to it, this old ghost Li just taught a good daughter, and now it's not as good as a daughter, this question will be calculated by the old man, and the answer will definitely be calculated tomorrow......"

Jia Siquan glanced at Li Zongming with disdain and said confidently.

"Hehe, the old man will wait and see, the old man will tell you..."Li Zongming touched his not dense beard, and said with a smile, full of confidence, he, the master of arithmetic, spent ordinary hands and feet, and finally calculated it with the help of the calculation, he didn't believe that Jia Siquan, a half-man, would be able to calculate it for a while.

"Is it twelve and seventeen?"

Yang Zheng silently calculated in his heart and opened his mouth to ask.

"Uh..."

Li Zongming's voice stopped abruptly, his hand shook, and his beard, which was not luxuriant, was pulled off a few more by himself.

"This is eleven verticals and sixteen squares horizontally, but it's not exactly one hundred and seventy-six squares, haha, it's good and clean..."

Jia Siquan silently calculated, suddenly realized, and said loudly.

"Brother Jia, didn't you secretly tell Qinghe about the topic last night?" Li Zongming couldn't take care of his beard anymore, and said to Jia Siquan.

"No, where can I tell Qinghe?"

Jia Siquan rolled his eyes and said angrily.

"Qinghe, how did you figure it out?"

Li Zongming couldn't care about being angry with Jia Si, stood up and took Yang Zheng's hand, and said eagerly.

"I'm guessing..."Yang Zheng was taken aback and said curtly.

Such the simplest binary equation can be calculated by powerful elementary school students, but this is in the Great Song Dynasty, and ordinary readers are really not sure.

"By the way, senior, I came today mainly to send something to Miss Xiaoman," Yang Zheng broke free of Li Zongming's hand without a trace, raised the box in his hand and said to Li Zongming.