The female servant in Su Hao's mind is none other than Han Qian, the daughter of the Han Wen family in Zhixian County.

Han Qian finally persuaded Dangzhixian's father to allow her to change into men's clothes and come to listen to Su Hao's class. The main reason for her disguise change was to avoid showing her true face in front of Su Hao and those students, as for the officials, they had actually seen this county magistrate's daughter. After all, the Han family lives in the back office of the county government, and the female dependents usually want to go out, or if they want to come to Han Wen for something, they will meet the officials of the county government. The society of the Ming Dynasty was still very open, and it was not a matter of immorality for a daughter like Han Qian to show her head in the county office.

Han Qian mingled among the officials, entered the East Pavilion as a classroom, and then found a corner to sit down. Her original intention was just to listen to Su Hao's Western doctrine, but she didn't want to attract Su Hao's attention. Who would have thought that after Su Hao started teaching, Han Qian was unconsciously attracted by what he said, and couldn't help but raise her head from time to time and make eye contact with Su Hao. The eyes are the windows of the soul, and Rao is a person who hides his dress, but the expression in his eyes cannot be hidden. After colliding with Su Hao's eyes a few times, Han Qian saw a hint of a smile in Su Hao's eyes, and she suddenly realized that her identity had been recognized by Su Hao.

You see what's going on, damn it!

Han Qian lowered her head in a panic, her heart pounding. She felt that Su Hao's gaze seemed to be with high temperature, and she couldn't bear the heat all over. If she was wearing women's clothes, then Su Hao stared at her like this, she could jump up and accuse Su Hao of being rude. But now that she has changed into men's clothes, she has been seen through again, and she really can't find a reason to protest.

Su Hao didn't know who this student dressed as a man was, he just felt that the existence of a girl made the whole classroom a little more angry. With a smile on his face, he was a little more energetic in his lecture:

"We just talked about rocks, and they can be divided into three categories according to their origins. The first type is called magmatic rocks, mainly basalt and granite, and the difference between them is the difference in the formation mechanism, basalt is ejective rock, granite is intrusive rock......"

Su Hao's knowledge is very profound, his lectures are simple and humorous, and the students in the classroom are amused by him from time to time, and even Han Qian can't help but laugh from time to time, covering her mouth and snickering. In this way, Su Hao was even more emotional, and he lectured on a lot of lectures, which made him admire himself.

After finishing a paragraph, Su Hao motioned for everyone to rest for a while, and he came to Fang Mengjin and Wu Zhicheng, and asked politely: "Master Fang, Mr. Wu, is the student quite clear?" ”

"The Western studies that I have changed to talk about, such as Huang Zhong Da Lu, are refreshing, the old man admires and admires." Wu Zhicheng praised.

Su Hao said: "Mr. Wu has won the award, the student is just a first glimpse of the door, how dare he say anything Huang Zhong Dalu." ”

Fang Mengjin waved his hand and said, "Change it, you don't have to be modest, you said it very well." I feel that what you are talking about is not only what the missionary said, but also your own experience, right? ”

Su Hao said with a smile: "Sure enough, I can't hide it from Master Fang, some of the content I talked about today is indeed something that I have comprehended myself, but everything is not far from its ancestry, and these truths are still deduced from Western learning." ”

Fang Mengjin said: "This Western study does have some doorways, after I heard it, I began to understand why the art of changing the well location is unpredictable, it turns out that everything has traces to follow." ”

"There are no ghosts and gods in this world, everything has its own mechanism." Su Hao said.

While the three of them were chatting, the officials in the back row felt that they were not qualified to observe, so they all left the East Pavilion one after another and went outside to bask in the sun. The talents were unwilling to let go of such an opportunity to learn, and they all gathered around them and listened to Su Hao and the two great Confucians discussing Western studies.

Han Qian was embarrassed to move forward, but she was really curious about what they were talking about, and after hesitating, she finally got into the crowd of auditors. She was most familiar with Fang Mengjin, so she stood behind Fang Mengjin, bowing her head and not daring to look directly at Su Hao.

Han Qian didn't dare to provoke Su Hao, but Su Hao would not let go of the only female student in the class, he arched his hand to Han Qian and asked:

"This brother, do you understand what the younger brother said just now?"

"You ask me?" Han Qian was caught off guard, raised her head and saw that everyone was looking at her, and her face couldn't help but turn red all of a sudden, and she didn't know how to answer.

"yes." Su Hao pretended to be stupid, "I don't know what Brother Tai is called." ”

"I ...... My name is ......" Han Qian stammered.

Fang Mengjin turned his head and saw that it was Han Qian standing behind him, he couldn't help but smile and said to Su Hao: "Change, this is the old nephew, named ...... Han Qing. ”

"Oh, it turned out to be Brother Han." Su Hao saluted Han Qian and said, "Little brother Su Hao, change the word." ”

This is Su Hao's bad taste, he already knows that the other party is a girl, but he has to pretend that he doesn't see it, and he calls each other brother one by one. In fact, when Fang Mengjin said that Han Qian's name was "Han Qing", Su Hao had already guessed the identity of the other party, in this county office, who could let Fang Mengjin play sloppy for her, and her surname was Han, except for the daughter of Han Wen of the county, who else could be?

Han Qian couldn't see that Su Hao was teasing herself, when he was talking about brotherhood, junior brother and the like, how could he be a little polite, it was clearly ill-intentioned. But the other party was unwilling to break the words, and it was inconvenient for her to expose it directly, so she could only learn from Su Hao's appearance, and also arched her hands, and said in a thick voice: "Brother Su is talented, and the younger brother has admired him for a long time." I don't know what kind of knowledge Brother Su is proficient in addition to this well survey, can you say a few things to open the eyes of the younger brother? ”

"Brother Han has a good reputation, how can the younger brother have any great talent, but he has learned a little exploration, surveying and mapping, metallurgy, hydrology, calculus, linear algebra, functional analysis, mechanics, optics, electricity, organic, inorganic, etc., which adds up to seventy or eighty kinds, which makes Brother Han laugh." Su Hao said happily.

In front of the old masters such as Fang Mengjin and Wu Zhicheng, Su Hao still tried to keep a low profile. But for Han Qian, he has no psychological pressure, showing off his talent in front of girls, which is an instinct that any mentally healthy man has, not to mention that Su Hao's body is only 17 years old now, which is the age of youthful sprouting.

"Bragging!" Han Qian replied to Su Hao's boast with two words, "How did I hear that Brother Su just learned from the missionary of the Buddha Machine for a few days, and in these few days, you can learn so many things?" ”

Su Hao pretended to be depressed and said, "No way, Brother Han, do you know what my biggest flaw is?" ”

"What is it?" Han Qian was really blindfolded.

Su Hao said: "The biggest shortcoming of my person is that I am too good, and I can learn everything as soon as I learn it, which makes me often fall into painful self-blame." ”

"You ......" Han Qian's mind was a little confused, and she was stunned for a while before she reacted, her face showed a thin anger, and she stomped her feet and scolded: "You person, why are you so flamboyant!" ”

"Haha, Qing'er, is it teasing you?" Fang Mengjin smiled, playing a round game, he turned his head to Su Hao and said, "Change, what you just said about organic and inorganic, are they also Western studies?" ”

"Exactly." Su Hao also came back to his senses, this is the Ming Dynasty, and it is not harmonious enough to be so flamboyant with a girl. Hearing Fang Mengjin divert his words, he hurriedly replied, "Master Fang, these are indeed the sayings in Western studies, and I also listened to what the missionary said. ”

"I just heard you talk about electricity, but it's the science of lightning in the sky?" Fang Mengjin asked.

"Yes, lightning is an electrical phenomenon." Su Hao replied stiffly.

Fang Mengjin asked, "This lightning also has a doctrine?" ”

Su Hao thought for a while and said, "It's too complicated theory, and I can't explain it clearly for a while, let's just talk about a simple one." Electricity can be conducted through metal, and if a wire is inserted into a cloud, lightning can travel through the wire to the ground. In the West, people know that when building a tall building, it is necessary to support a wire on the roof of the building, and then go all the way to the ground, so that the tall building will not be struck by lightning, which is called a lightning rod. ”

"What Brother Chang said, didn't he mean the method of the fish? "Han Ji" contains: Bailiang palace disaster, after the Yue Wuyan, there are fish in the sea, the tail is like an owl, the torrent is rainfall, so it is like its image in the house, in order to be tired of fire. This seems to be in line with the lightning rod that Brother Gai said. A Xiucai standing behind Wu Zhicheng said to Su Hao.

Su Hao raised his eyes and recognized that the Xiucai's name was Ma Yu, who was said to be a Xiucai who was admitted in the same year as himself. However, Su Hao is the last among the talents, while Ma Yu is the first. In the morning, when Su Hao performed linear planning in the academy, this Ma Yu was the most serious one. Now that he can recite a rare ancient text when he blurts out, Su Hao can't help but feel a little ashamed: "Uh, what Brother Duwen said is very true, this owl is actually the lightning rod of ancient China, but the law of the owl is based on the gods, and the principle of lightning rod is still a little different from that of the Westerners." ”

Su Hao hadn't read the article that Ma Yu said, but he knew more or less about what Ma Yu said. This was a matter of the Han Dynasty, when Weiyang Palace and Bailiangtai in the Han Palace were struck by lightning and a fire broke out. A monk named Yongzhi proposed to Emperor Wu of the Han Dynasty that an animal called the Bird could prevent fire, and that such disasters could be avoided by installing something in the shape of an Owl on the roof, which was the earliest lightning rod in China.

In fact, the eagle's ability to protect against lightning strikes has nothing to do with its shape, mainly because the decorations on the roof are made of metal, and there are sharp objects pointing to the sky, which can attract electricity in the air. Compared with modern lightning rods, the disadvantage of the Owl is that there are no metal wires leading to the ground, but in rainy days, the building has a certain conductivity after being wet, so it can also play a role in lightning protection.

In the Ming Dynasty, craftsmen summed up the experience of their predecessors and began to try to connect the metal wires buried in the ground to the owls, which is not much different from the modern lightning rods. At this time, Franklin, who invented the modern lightning rod, was still in a single-cell state.

Fang Mengjin said with a smile, "In this way, when my Ming people built houses, they either placed an owl on the roof or a dragon kiss, which actually implied the lightning rod method in Western learning?" ”

Su Hao said: "The role of science is to explain the knowledge that people have mastered in their daily lives, and to generalize it. The purpose of a fish like this one is to draw lightning to the ground so that it does not destroy the house. Therefore, the shape does not have to be made to look like an owl, but to make it into the shape of a fish bone. ”

"I see." Everyone nodded in approval.

"Who knows if it's true." Han Qian pouted and muttered in the crowd. In her heart, she actually believed a little bit of what Su Hao said, but she refused to admit that she let Su Hao deliberately pretend to be stupid and trick her.

Su Hao smiled and said, "This thunder and lightning thing can't be tested, I have a very simple experiment to show you what electricity is all about." Brother Han, can you lend that hair on your sleeve to your younger brother? ”

"My hair?" Han Qian looked down and saw that there was indeed a piece of her own hair on her sleeve, and her face turned red again.