The best old woman is too fierce, stepping on her ex-husband and beating up her traitorous son!

Thinking of the century-old history of humiliation in the past life, it was because of the backwardness of science in modern times that the enemy country knocked on the door and suffered humiliation and massacre.

If they remain in the lead, even if the dynasty changes, the Han people will still be the masters of this land and will not be exploited by foreigners.

In the evening, the things that Carpenter Sun had made were ready.

Carpenter Sun asked his apprentice Xiao Shitou to bring it over, and said with a smile: "Sister Yue, you asked my master to make this. Can I buy three belly lenses from you?"

"I want to make something that can see far away, and I also want to make a magnifying glass for Master. This way Master doesn't have to squint to see."

Li Xiaoyue rubbed Xiao Shitou's head, "Of course not."

Xiao Shitou's fleshy little face suddenly showed a disappointed expression, "Is it expensive?"

"I won't sell it to you, but I can give it to you." Li Xiaoyue smiled, "Are you happy?"

Hearing Li Xiaoyue's words, Xiao Shitou's eyes instantly lit up, "Really?"

"Of course it's true!" Li Xiaoyue smiled, "Actually, these lenses have many functions. Aren't you curious?"

"Curious!" Xiao Shitou's eyes widened with a serious look on his face. "The weather is nice today. I held a magnifying glass and the light spot fell on my palm. I felt hot and almost burned me. This is the sun shining on my hand. Is the heat concentrated together and transmitted to my hand?"

Li Xiaoyue looked at Xiao Shitou's eyes full of curiosity and looked at the child up and down. He was a good prospect for scientific and technological research.

"We all know that the sun is warm when it appears, and light is hot. Through this lens, many light beams can be concentrated together, and the heat is also concentrated together, so you will feel hot."

"This is similar to the flow of water in a river. Where the path is narrow, the flow will be more turbulent. It's similar."

Xiao Shitou frowned, "Sister Yue, I suddenly feel that what you said makes sense. I always feel that this thing can have more functions, but we haven't discovered it yet."

"Yes, how about we study together?" Li Xiaoyue guided Xiao Shitou in the direction of a scientific madman, so that he could study more natural sciences in the future.

Xiao Shitou's eyes lit up, "Is this really possible?"

"Of course." Li Xiaoyue replied, "Are the numbers I taught you before useful?"

Xiao Shitou nodded, "It's useful."

"We will mark it with those numbers in the future, and we will study these lights together." Li Xiaoyue smiled and rubbed Xiao Shitou's head.

"Okay!" Xiao Shitou smiled, "Sister Yue, I'm going back. Master is still waiting for me to eat."

"Then you go back and be careful when walking." Li Xiaoyue sent the small stone to the door, which further strengthened her idea of ​​spreading basic natural science.

After Li Xiaoyue came back, she began to compile primary school mathematics textbooks.

Addition, subtraction, multiplication, division, fractions, etc.

Li Xiaoyue wrote very seriously, and before she knew it, it was getting dark outside.

Gongsun Lian is leaving tomorrow, so he came here to say goodbye today.

Seeing Li Xiaoyue writing something in the study, he knocked on the door and walked in.

"What are you writing?" Gongsun Lian asked, looking down.

He knew the set of foreign symbols used by Li Xiaoyue.

Li Xiaoyue replied: "I have been thinking in my mind recently that we Dayan people usually attach great importance to the Four Books and Five Classics, and all other research has become miscellaneous subjects."

"Actually, I think the Four Books and Five Classics teach people the principles of life, cultivate people's sentiments, or how the ruling class governs the people."

"What really drives the development of this era is the research of countless craftsmen. For example, doctors study medical skills to treat diseases and save people, so now there are more and more good prescriptions and more and more treatment methods."

"For example, carpenters' skills have been passed down and developed, and they have built more and more things, which greatly facilitates our lives." "For example, the loom and spinning wheel I made have greatly improved labor productivity and increased the price of cloth. It’s cheaper and more people can wear decent clothes.”

"Also, look at the thing in my hand. It's just a piece of jade that's thick in the middle and thin on the sides. You can enlarge the font."

As Li Xiaoyue spoke, she picked up a magnifying glass and placed it on the words she had just written.

Gongsun Lian was slightly startled when he heard this. He took the magnifying glass and touched it in his hand. It was indeed a round piece of jade that was thick in the middle and thin on both sides.

"It's night now, and I can't verify another function of the magnifying glass for you. If it's under the sun, if the focus of the magnifying glass falls on licorice or some flammable things, it can catch fire."

Hearing this, Gongsun Lian couldn't put it down, "Can you give this to me?"

Li Xiaoyue nodded, "Of course, but I think you might want another thing more."

Gongsun Lian looked surprised, "Are there any other good things? You can take them out together, don't whet my appetite!"

He is now becoming more and more curious about why Li Xiaoyue learns so many things?

Is it possible to figure it out just by thinking about it in your mind?

Li Xiaoyue took out five telescopes, which can also be telescoped and adjusted to adjust the focus.

"Use this telescope to look at the observation tower of Dongshan Military Camp on the top of the mountain through my window."

"Telescope?" Gongsun Lian was slightly startled when he heard this, and looked up into the distance, "Looking through the window, you can only see a bright spot."

Then Gongsun Lian took a telescope to look at the bright spot, and was slightly startled, "There is a person actually asleep in the observation tower!"

"Oh, how can I see clearly? From such a long distance, I can't see it with the naked eye!"

After saying that, he put down the telescope and looked at the bright spot again.

I repeated it several times and felt quite excited.

Li Xiaoyue smiled and said: "Now you can roughly calculate the distance based on what you see and practice more."

"Bring this with you, it might come in handy on the road!"

Gongsun Lian couldn't put it down, "Am I the only one who has it?"

"Of course not!" Li Xiaoyue replied, "One for my father, one for my eldest brother, and the remaining one, I will ask Chang Fu to give it to General Huo tomorrow."

"This thing can play a greater role in the hands of General Huo on the battlefield."

Gongsun Lian nodded repeatedly. Just now he thought Li Xiaoyue had given it to someone just for him, and he was secretly happy.

Now I feel narrow-minded.

How could such a good thing be kept privately?

The uses of this thing are really great.

"Do you have any good stuff here?" Gongsun Lian asked.

Li Xiaoyue shook her head, "That's all for now. I'll tell you when I make new discoveries."

"In addition, very few people can actually pass the imperial examination. Being able to pass the imperial examination is already pretty good!"

"Many people read just to know a few words. I want to teach them arithmetic and some things in science. Transform some of the arithmetic knowledge of our ancestors into more understandable content and use these symbols to express it, making it easier to learn. Easier to remember and easier to use." (End of chapter)