I am the cook, but I am Li Er's son-in-law

Several little girls responded, they were still very interested in this matter.

With the drawings, even though the parameters are unknown, the bicycle was built within three days, and a few girls asked Qian Niuwei, who was dressed in plain clothes, to carry this thing to the restaurant.

This morning.

"Brother Zhengyang, we've got the stuff!" After picking up two buns outside, Li Lizhi walked in while chewing on them.

Yin Xuan was serving several people in the kitchen. Hearing the movement, he poked his head out of the kitchen, responded, then turned and went in again.

The little girls were not angry either, it was like this every morning.

They sat where they used to sit, gulping down soy milk.

Breakfast time passed.

The guests came in small groups and went to the teahouse again. There will be a Go game later, and it is not time for dinner, so it is better to go and watch in person.

Yin Xuan came out of the kitchen, turned his head and glanced: "Where's the car?"

Li Lizhi pointed to the backyard: "It's in the back."

Yin Xuan walked in, pushed the car out, took a few glances, smacked his lips, and started to make trouble: "The handle of this car is too low."

"The seat is a little too high."

"There are still fewer spokes, after all, it is made of wood, and more spokes will feel more stable."

"The wheels are a bit small, too."

The faces of the little girls were downcast, how could it be like this, they worked so hard, and even formed it with their own hands.

"But it's the first prototype after all." Yin Xuan commented, then turned to look at them, "It's great to be able to do this."

Their complexions suddenly turned from cloudy to sunny.

"Brother Zhengyang, can you tell us how to use this thing now?" Li Lizhi blinked expectantly.

After assembling the bicycle last night, Li Lizhi wanted to try how to use this thing.

But I sent a few people, without exception, as soon as their feet left the ground, they would fall down with a snap.

This made Li Lizhi very angry.

This thing is too disgusting, it doesn't give her the face of the majestic Princess Changle of the Tang Dynasty at all, and today she didn't even think about letting it go to the ground, so someone moved it here.

The other three little girls are also looking forward to it.

Yin Xuan waved his hand, pushed the cart out of the restaurant, and the four little girls came out behind him.

"Look, that's how you ride." Yin Xuan pushed forward, stepped on the pedal, got on the bike, stepped on another raised pedal hard, and the bike slid and went fast. ran forward.

The four were dumbfounded.

Just... ride out like this?
Haven't fallen yet?
Yin Xuan rode to the corner of the street, turned back, and stopped at the entrance of the restaurant.Followed by a group of people who were originally watching the excitement in the teahouse, but felt that what Yin Xuan was doing was even more exciting.

"See, that's how you ride." Yin Xuan got out of the car and said with a smile to the four little girls.

In the lap just now, I learned a lot.

The vibration is obvious, but it is still more comfortable than the bullock cart, and the second is that the speed cannot be raised. This should be a problem of craftsmanship.

Wooden tires are indeed very suitable players, but shouldn't it be considered to wrap a layer of animal skin on the outside?
The brakes are also a problem.

Sure enough, without rubber, many things are restricted.

"Why didn't you fall down?" Li Shu's eyes were full of doubts. There were many force diagrams in her head just now, but each force diagram proved that Yin Xuan should fall.

But Yin Xuan just didn't fall.

She felt that the knowledge she had learned from Yin Xuan for such a long time, and the new world view she had forged, showed a trace of being broken again.

Yin Xuan rubbed her head: "I don't know either."

This very natural tone made Li Shu stunned.

"I'm not lying, I really don't know." Yin Xuan shook his head and sighed with emotion.

Why the bicycle does not fall, the hypothesis put forward at the beginning is the spiral effect, but this hypothesis was quickly overturned, and the specific real reason has not been studied by later generations.

This is one of the unsolved mysteries of science.

"It's hard to believe?" Yin Xuan glanced at Li Shu and asked again.

Li Shu nodded.

Yin Xuan pinched her little face: "But this is the truth, I can't make up a reason for something I don't understand."

"But that's the fun of learning, isn't it?"

Li Shu nodded again, looking at the bicycle, there was a hint of challenge in her eyes suddenly, wouldn't it be more interesting if she could research something that Zhengyang brother didn't even know?

The spectators from behind followed, looking at the bicycle Yin Xuan was pushing in his hand, they were amazed.

Someone asked: "Shopkeeper, what is this thing you are riding?"

"Bicycle." Yin Xuan turned his head, facing the man, and said with a smile, "A new means of transportation, invented to deal with concrete roads."

"It is still in the research stage, and it may take some time before it can be launched for sale."

The onlookers were even more amazed.

"Shopkeeper, how much do you plan to sell this bicycle?" A scholar asked, he couldn't wait, his family lived far away, in Xuanpingfang.

Even if you leave home as soon as the curfew is over, you can't catch up with the breakfast in the restaurant.

If it weren't for the Go games in the past few days, he wouldn't come to Huaizhenfang every day - anyway, he didn't have much money in his pocket, so he couldn't eat in restaurants every day.

But if he had a bicycle, he would be able to come to Huaizhenfang every day. Even if he couldn't eat in the restaurant, it would be a good thing to come to the teahouse to play chess.

Now the teahouse is almost becoming a sanctuary for chess lovers like them.

The environment is good, the chess pieces are good, and the service is good...

Unless you are tossing in your own home, how can you enjoy a chess room that is not expensive, where you can eat dim sum, burn incense, and even eat hot pot.

Yin Xuan glanced at Li Lizhi, and asked generously, "How much did it cost you to study this thing?"

Li Lizhi's answer was very rich and powerful: "I haven't counted it, but there should be a few..." She looked at Li Shu.

Li Shu shook her head: "Sister, I didn't remember these things either."

The two little girls looked pure, but in the eyes of the onlookers, they were full of faces of "I don't care if I have money".

After hearing what they said, some people laughed bitterly.

How many times?

Then it seems that this thing will not be cheap, at least... If it is a few pennies, most of them may not be able to afford it for a while.

Yin Xuan curled his lips calmly, the reason why these little girls talked a lot was not because they had a vague idea.

It is precisely that they have no concept.

It is estimated that the cost is not too much, they only know that it is not much money this time - and a few times is probably the lowest value they can come up with.