Zhang Shouren had obviously seen this a long time ago, and instructed Zhang Zhending and said, "I won't go and help!"

Then he said to Zhang Jingxuan: "You can't go up, otherwise, my uncle knew that I didn't care about it and would definitely scold me to death!"

Zhang Jingxuan laughed and said, "Don't worry, I've found a replacement."

After saying that, Zhang Jingxuan took out a living goat from the carriage and handed it to Zhang Zhending who came over to help: "Here, tie it to the kite, tie it in the middle, tie it firmly!"

As long as the girl in the patriarch's family is not so annoying and strange, there are still people who are willing to get close to each other. At least cousin Zhang Zhending is one of them.

After everything was finished, Zhang Jingxuan walked to Fang Jingnan and said, "Yesterday I asked you, what is outside the sky, you didn't answer me. Actually, I asked many people, but they couldn't answer, so I thought, if I could fly like a bird, would I be able to see it?"

Seeing Fang Jingnan's dazed look, Zhang Jingxuan smiled and said, "Don't worry, I've tried it. Flying can fly up, but it's not stable when landing, and it's easy to fall to death!" After that, she laughed at herself.

Seeing Zhang Jingxuan commanding his servants to ride on a horse with excitement, running and flying kites into the sky, and dancing and envious, Fang Jingnan couldn't help but think, "It's really an unusual child!"

After trying several times, the kite finally flew into the sky. A big kite more than five meters wide, tied with a goat, soaring over the lake. For a moment, Fang Jingnan was a little confused.

How long has it been, in addition to some birds, I finally saw some different scenery in the sky!

The poor goat was bleating and Zhang Jingxuan was giggling.

"Is your dream flying into the sky?" Fang Jingnan asked softly.

"No," Zhang Jingxuan blinked, but Fang Jingnan replied unexpectedly: "I don't have a dream!"

...

Perhaps this is true. Zhang Jingxuan is not confused about flying into the sky. She seems to be just interested in everything unknown.

After flying the kite for a while, Zhang Jingxuan threw away her subordinates, rode her Xiaobai and returned to Puzhou City with Fang Jingnan.

On the way back to the city, Zhang Shouren saw that the two were having fun, and Fang Jingnan didn't need him to accompany him at all, so he asked his son Zhang Zhending to accompany him and found a reason to leave first.

Fang Jingnan also waved his hands to Xingfeng Niu Youde and others, indicating that they didn't have to follow them so closely, just protect them from a distance.

"Sir, you have to be considerate of your subordinates. If I dare to leave you, Jiang Lifangcheng will definitely report to Team Leng after he goes back." Xingfeng did not agree, and he was still with Fang Jingnan to protect him, just letting the others go away.

It was nothing more than one person. Fang Jingnan did not persist and followed Zhang Jingxuan all the way. Finally, the few people stopped outside a blacksmith shop.

"You want to shoot something?" Fang Jingnan asked.

Zhang Jingxuan shook her head, took Fang Jingnan's hand, and walked into the shop. Xingfeng and Zhang Zhending followed behind her.

Fang Jingnan, the blacksmith shop, also saw a lot. After entering, she glanced around and didn't see anything special.

This iron shop is quite big, with five stoves burning even more vigorously, and dozens of shirtless strong men are playing with iron. You can feel that the people here are familiar with Zhang Jingxuan. When they see her coming, they all smile at her and greet her without stopping their work, and still leave her everywhere.

Zhang Jingxuan came to a stove with great fire, pointed to the large copper pot with water on it and said, "Brother, what did you see from that pot?"

Fang Jingnan looked at the big copper pot carefully. After looking at it for a long time, he felt that this pot was no different from an ordinary copper pot.

It's just a little bigger. In terms of shape, the belly of the pot should be wider and the water will be filled with more.

Fang Jingnan shook her head and smiled, "I saw an ordinary pot!"

Zhang Jingxuan smiled proudly and said, "Look at the lid of the pot carefully!"

At this moment, due to the strong fire, the boiling water inside was scalding, and waves of hot air rushed upwards, pushing the lid of the pot up and down, and then lifting up again.

Fang Jingnan looked at it for a while and said, "What's wrong with a thin cover?"

Zhang Jingxuan stroked her forehead cutely with her little hand, and said with a hopeless look: "I have brought a lot of people to see you. You are the stupidest one. Didn't you see, is the lid of this pot moving?"

"Uh, I saw it, what's wrong?"

Zhang Jingxuan looked at him with an idiot's eyes, "Oh my God, what's wrong? No one pushed the lid of the pot, how could the lid of the pot be moved by itself?"

Fang Jingnan blurted out: "It's so steam!"

After saying that, Fang Jingnan regretted it. Before the invention of the steam engine, people did not know much about steam power. It was so that no one noticed and studied it, but few people knew it.

Zhang Jingxuan's eyes lit up and she said excitedly: "Do you know water vapor? Then do you know where this power comes from? Where did it disappear?"

Several questions made Fang Jingnan dizzy. It was not that Fang Jingnan couldn't answer it. Is this common sense still missing? Fang Jingnan was just surprised that this little girl knew so much, and her thinking direction was still the principle, not the application.

"This... is the heat energy of fire, which is converted into the kinetic energy of steam, and finally becomes the potential energy of gravity!"

As soon as Fang Jingnan finished speaking, Zhang Jingxuan was stunned, Zhang Zhending was stunned, Xingfeng was stunned, and a few blacksmiths who eavesdropped were also stunned.

Fang Jingnan smiled, gently hugged Zhang Jingxuan's shoulder, and took it out, "It's too hot here, little girl, come less in the future. If you are interested, I can teach you!"

"Heat energy? Kinetic energy? Potential energy? Conversion?"

Zhang Jingxuan was chanting these four words in a daze, with a look similar to Wen Chaoyi.

The four of them left the blacksmith shop, and Zhang Jingxuan's eyes were gone, and her eyes were stunned.

"Send her back!"

Fang Jingnan knew that she couldn't go shopping today, so she whispered to Zhang Zhending, and the group led the horse to the Zhang family's house.

The county town of Puzhou is not particularly large, about 700 steps across and vertically, which is almost the same as Yingzhou City. Zhang's house is located on the edge of the main road east of the city, and it is a big house with three entry points.

In ancient times, there were regulations on building houses. Generally speaking, merchants could not build large houses without status. However, Zhang was not only a merchant, but many people in the clan had served as high-ranking officials, so the ancestral home was not small.

When she reached the gate, Zhang Jingxuan finally came to her senses in front of the two stone lions. She smiled and said to Fang Jingnan: "Do you know why you took your brother to see these?"

Fang Jingnan shook her head, and Zhang Jingxuan said seriously: "Because I didn't see ridicule in my brother's eyes, others think I am a crazy girl, only you, there is curiosity and surprise in my eyes, and there is no absurdity!"

absurd?

Fang Jingnan thought to himself that technology is the primary productive force. I don’t understand it myself and I don’t have the interest in specializing in research. Will I laugh at people who are interested in technology?

Are you stupid to criticize?

Fang Jingnan cursed Ju Guo secretly, squatted down, looked straight at Zhang Jingxuan's eyes, and said slowly and forcefully: "Maybe some people call these strange and lewd skills, but I think... the prosperity of Han civilization will take strong steps from this, from this ancient city where the birthplace of a thousand-year-old civilization, from this Yao capital, from this Shun soil, from this Yu seal!"

Puzhou, formerly called Hedong, the birthplace of the three sage kings of Yao, Shun and Yu. Later, the famous story of "Hedong Lion Roar" is also about this place. The Yellow River turns a big bend here and walks dozens of miles south. It is a very famous military ferry, Fengling Ferry!

Fenglingdu is the place where Chiyou and Huangdi fought a great battle, the birthplace of Han civilization. It is the main way of Guanzhong's throat and a place where military strategists must fight for.

However, what makes Fang Jingnan most familiar with this place is the same poem: When we first met at Fengling Ferry, we missed our life when we saw Yang Guo.

Fang Jingnan touched her nose and smiled secretly: Fortunately, I recognize my sister!

"Do you really teach me?" Zhang Jingxuan did not understand what Fang Jingnan said, but her curiosity about the unknown made her look forward to the days ahead.

"Yes!" Fang Jingnan focused heavily.

"Hehe, see you tomorrow!"

Zhang Jingxuan smiled sweetly, and Jing Nan waved her hand and walked towards the side door with Xiaobai. But as soon as she arrived at the door, a middle-aged man was pushed out of the inside in a mess.

Seeing the person coming, Zhang Jingxuan politely said: "Hello, uncle!"

This person was Zhang Shouyi, the second-bedroom advocate of the family of Zhang Jingxuan, who had discussed the division of Zhang Jingxuan's family resources with the big house in the ancestral tomb Yang House.

"Go away!"

Seeing Zhang Jingxuan, Zhang Shouyi snorted coldly and left without paying attention.

When walking past Fang Jingnan, Zhang Shouyi looked rudely and glanced back and forth on him.

Zhang Jingxuan didn't care about his second uncle's bad attitude, so she made a face at Fang Jingnan and ran into the house.

Zhang Zhending also smiled awkwardly and said, "This is the case with my second uncle. He has a bad temper, but he is actually very righteous. When I was a child, I was bullied by the Yao family, he helped me stand up."

Fang Jingnan smiled. How could he get angry about such a trivial matter?

"You go back too, I'll go back to the inn to rest!"

"Will you still use me tomorrow?" Zhang Zhending asked before going back.

Fang Jingnan smiled and said, "Would you like to follow?"

Zhang Zhending said indifferently: "I can do it, but I have something to do before noon tomorrow, so there is no problem in the afternoon."

Fang Jingnan nodded and said, "Well, then you can come here in the afternoon."

"Okay, see you back!"

"Um!"

Fang Jingnan agreed and separated from Zhang Zhending and took the people back to the inn.

On the way, Fang Jingnan was still thinking about Zhang Jingxuan. In terms of science, there were several strong people in the Ming Dynasty today.

The most famous one is Xu Guangqi (who died two years ago), the founder of Chinese geometry, who is well aware of agriculture and has written a complete book on agricultural affairs.

And one with a reputation similar to him was named Wang Zheng, commonly known as King Nanxu Bei.

Fang Jingnan felt that he could not meet these two people for the time being. Since that is the case, Zhang Jingxuan looked quite talented and could still remember many theories in his mathematics and physics.

Just forget about chemistry, it’s too practical. Fang Jingnan only remembers that hydrogen and oxygen react to produce pure water.

"Well, it seems that I have to call me Teacher Xiao Fang in the future, haha!"

Fang Jingnan smiled self-deprecatingly. At this moment, there was a sudden riot in front of him, and many people hurriedly ran towards Fang Jingnan.

"Murder, the Hu family is killing, the Wu surnamed Hu bullies the Lao Zhang family!"
Chapter completed!