After listening to Xiang Han's words, Liu Xie was overjoyed and hurriedly nodded: "Great!" ”

"Well, anything else?" Xiang Han asked with a slight smile.

"I didn't ...... Gone! I wish my brother-in-law and sister an early birth to a precious son! After speaking, Liu Xie trotted all the way out of Xiang Han's study.

"This kid!" Xiang Han smiled and didn't say anything, just shook his head.

After Liu Xie left, Xiang Han had nothing to do, and what he was thinking about now was how to teach children physics, chemistry and biology in the next semester.

First of all, he needs a set of textbooks, but what is the starting point of this textbook? What should he start with, to teach this knowledge, and those so-called theorems and theorems, how can he come up with them, and how can he prove them?

The current science is still in the very beginning stage, and it has not even reached the surface of the future generations, so Xiang Han still has to explore how to proceed with this beginning!

"Forget it, let's take one step at a time." Xiang Han thought about it for a long time and didn't figure out what to do, after all, he couldn't remember the first lesson of the knowledge he learned in middle school!

"Master, Ma Jun is looking for it." At this time, the butler came to report.

"Oh? What's the matter with this kid Ma Jun? Xiang Han was slightly stunned, then shook his head, got up and came to the front hall.

"My lord! It worked! We did it! When he saw Xiang Han, Ma Jun was very excited.

"Succeeded? What the? Xiang Han was a little puzzled, not understanding what Ma Jun meant.

"Lord, look at this!" As he spoke, Ma Jun carefully took out a cloth bag from his arms, and then unfolded it in front of Xiang Han.

This is......

After Xiang Han saw it, he was very surprised, isn't this glass?

"You made the glass?!" Xiang Han was a little surprised.

"Well, after two years of research, we have finally created this transparent glass that the lord said!" Ma Jun nodded.

It is worth mentioning that a long time ago, Xiang Han gave Ma Jun the manufacturing method of glass, but the glass made for the first time was not transparent, sometimes reddish-brown, sometimes blue-green, anyway, there are basically all kinds of strange colors, but there is no transparency!

And after Ma Jun and the others learned from Xiang Han's mouth that glass has a transparent color, they immediately had doubts, can glass really make it transparent?

However, out of trust in Xiang Han, the craftsman workshop set up a special department and ordered a shop to study and manufacture glass!

After more than two years, such a transparent glass was finally made!

Fortunately, in the past two years, this glass workshop has been able to be self-sufficient, after all, these colored glass products are also works of art, even if they are glass, they do not have such colorful colors. Therefore, these "invalid" bottles and cans can still be sold for some silver!

This matter was left behind by Xiang Han, and he didn't have any hope at all, but he didn't expect that Ma Jun really gave him a big surprise today!

"Your glass is very transparent, does this kind of glass produce energy?" Xiang Han asked.

"Yes, no problem!" Ma Jun nodded, and then slowly began to talk about the problems they encountered when making glass.

At the beginning, no matter what to do, even if you used the method given by Xiang Han and added various things, there was no way to eliminate the color, and everyone had to give up several times, but later, Ma Jun had a whim and rebuilt a new blast furnace, a brand new, better sealed blast furnace, which was specially used for refining glass!

Not to mention, in this way, the color of the glass is really getting lighter and lighter!

At this moment, Ma Jun realized that this seemed to be a problem with the blast furnace, so after he continued to improve the blast furnace and constantly change the secret recipe of blending, transparent glass was born!

And, it is worth mentioning that this transparent glass was born very early! It's just that Ma Jun wants to keep improving, and too many impurities are not allowed in it, so it has dragged on to this day!

"Good! That's great! Next, you go and create such a piece of glass. As he spoke, Xiang Han drew a convex lens and a concave lens on a piece of paper.

"This is ......" Ma Jun looked at the two lenses with some curiosity, and then looked at Xiang Han.

"This is called a concave lens, this is called a convex lens, specifically, it is used to magnify and reduce imaging!" Xiang Han smiled slightly and explained.

"Imaging? Magnify? Shrink? Ma Jun was a little baffled by this series of words.

"That's right, you see it's a word, if you drop a drop of water on it, will the word be slightly enlarged?" Xiang Han smiled slightly.

"Huh? Really! "Ma Jun seems to have discovered a new world.

"This drop of water is like this convex lens, of course, if you make a convex lens, it will be much more magnifying than this drop of water, and we will be able to use this convex lens and concave lens to make magnifying glasses, telescopes, and even ......microscopes later," Xiang Han simply counted the things that could be made with lenses.

"This ...... So amazing? Ma Jun swallowed his saliva, a little incredulous Xiang Han's words.

"Of course, you'll know when the time comes, and as for the curvature, you can make some of it!" Xiang Han can't be too demanding, the curvature of this thing, there shouldn't be a way to control it too much now, right?

Therefore, Xiang Han decided to wait until the manufacturing was completed, and assemble it on site to see how big it was suitable and the right size to continue production, and if it was not suitable, forget it!

"Yes!" Ma Jun was full of energy and nodded hurriedly.

……

Jingzhou, Jingzhou Academy.

"How about Kong Ming? Now that Xiang Han is unifying the north, he is on the verge of winning the Central Plains, don't you admit it? Two little children were arguing there.

These two children look like they are both eleven or twelve years old, one is extremely handsome, a proper little Zhengtai, and the other is extremely ugly, as if they climbed out of some coal pile, and the appearance of the two has become a stark contrast!

"What about unifying the North? The current Xiang Han is like a paper tiger, weak and weak, if Cao Cao is willing, he will definitely be able to take down part of Xiang Han's territory, but Cao Cao is unwilling! "The handsome little Zhengtai Road.

"Humph! You're a dead duck with a hard mouth! The slightly ugly little boy spoke.

"Or, let's make a bet!" Xiao Zheng Taidao.

"Bet on what?"

"You help Xiang Han, I will choose another lord, and when the time comes, the two of us will compete to see who is more powerful!" Xiao Zheng Taidao.

"Good! Interesting and interesting, I must make Kong Ming convincing you! ”

"It's a deal!"

"It's a deal!"

(End of chapter)