Chang'an, take the meaning of long-term stability.

Chang'an is located on the bank of the Weishui River, relying on the northern foot of the Qinling Mountains, the geographical position is superior, a total of more than a dozen dynasties have been the capital of this for thousands of years.

Chang'an City is also changing with the change of history, the original Chang'an City has not found traces, the current Chang'an City is still rebuilt by the order of Emperor Gaozu Yu Yang, the whole Chang'an City is surrounded by dozens of meters high city walls.

At the north gate of Chang'an City, Yu Zhiqian led a group of students to the bottom of the city wall, Yu Zhiqian looked up at the tall city wall, and remembered some memories of the first time he went to Xi'an in his previous life to circle along the Xi'an city wall.

"How were such tall walls, ancient wars, breached!"

The Yu Tang Empire was established by force, and since the Emperor Yu Yang of Gaozu ascended the throne, Chang'an City has not been affected by the war, and the newly repaired Chang'an City does not see any traces of war at all.

Before the gate of Chang'an, there were already a lot of queues to enter the city, and the Tang people only needed to show their identity waist cards to enter Chang'an City, without collecting taxes, while the Hu people had to be inspected, and the soldiers guarding the city had some oil and water from time to time.

With the arrival of Yu Zhiqian, the main city gate opened, and the surrounding city gate officials did not dare to collect money, and implemented the inspection standards with a serious face, Hu Ren lowered his head and did not dare to have any rebuttal, and he did not even dare to speak loudly, in Chang'an, the status of Hu people was not much higher than that of livestock.

Although the surrounding Yu Tang people did not know Yu Zhiqian's identity, when they saw the main city gate opened, they all knew that Yu Zhiqian's identity was not ordinary, and some people had never seen the main city gate open several times in their lives in Chang'an City.

Many people stopped to watch, and the number of onlookers slowly increased.

A group of children of the noble family got out of the carriage, not knowing what Yu Zhiqian was doing when he took them to the North City Gate, Yu Zhiqian watched them all get off the carriage, and slowly took out two balls from the carriage.

Both are iron balls, one of which weighs ten pounds, and the other only weighs about one pound, and you can immediately feel the difference in weight between the two iron balls when you hold them in your hand.

A group of people, Xungui and the children of the family, looked at Yu Zhiqian with a confused expression, not knowing why Yu Zhiqian did this.

"Everyone pass it to each other, feel the weight, and then there will be a question for you!"

Yu Zhiqian said while motioning to pass the iron ball to everyone, this group of students did not dare to have any objections, and after trying the weight one by one, they looked at Yu Zhiqian with a puzzled expression.

Yu Zhiqian had a faint smile on his face, and he was already shouting in his heart: "You scumbags, you are about to subvert your three views!" ”

But Yu Zhiqian's face did not change at all, and after holding the iron ball in his hand, he looked at the group of students in front of him: "Since you have entered my door, I will teach you well, today I will teach you the first lesson, now I ask you, if these two iron balls fall at the same height on the city wall, will the big iron ball land first, or the pound heavy iron ball will land first!" ”

After hearing Yu Zhiqian's inquiry, everyone was happy, and Yu Chi Yulin's voice was the loudest: "Your Highness, this must be the big iron ball that landed first!" ”

"Are you sure?"

"Of course! Although I Baolin can't read, I still know these common sense! ”

"Then why do you think the big iron ball landed first!"

Yu Chi Yulin thought for a moment: "Of course, it's because the big iron ball is heavy!" ”

"In that case, this palace will make a bet with you, I don't know which of you is willing!"

Yu Zhiqian smiled and took out a piece of cloth, on which were written three options, the big iron ball first, the pound heavy iron ball first, and the same landing, and then slowly looked at all the students: "The big iron ball lands first, one loses five, one pound heavy iron ball lands first and loses five, and at the same time lands one loses two, which of you is willing to bet with this palace!" ”

While speaking, he glanced at this group of students, and his heart was already happy, this group of guys came to his Tsinghua Park to take classes, and they didn't charge tuition, and they didn't earn some of them, how could they be worthy of themselves.

There is a saying that the Fa is not passed on lightly, and the same is true of knowledge, if you want this group of people to remember these things, you must let them have more profound memories.

"Is that His Royal Highness the Crown Prince?"

"It seems that yes, I heard it as if it called itself Hongu!"

"It seems to be really His Royal Highness the Crown Prince!"

"They seem to be discussing who will land first if the big iron ball or the one-pound iron ball is thrown from the city wall!"

"What's there to discuss, it must be a big iron ball!"

"This group of noble children is full of food and has nothing to do!"

"Be careful!"

The people around him were talking, and at the same time, their curiosity was aroused.

And the students around Yu Zhiqian were all stunned after hearing Yu Zhiqian's words, watching Yu Zhiqian open, and looking at Yu Zhiqian with some uncertainty: "Is Your Highness serious?" ”

"Of course, Tong Su is not bullied, if you press 100,000 taels and win, even if the palace sells the East Palace, you will be compensated to you, you should know that Tanggou wine is the property of the palace, are you still worried that the palace can't afford to lose?"

After hearing Yu Zhiqian's words, many children of the family were ready to move, and Yu Chi Yulin was the first to take out three hundred taels and directly pressed on the big iron ball to land first, and then Cheng Chumo grabbed Yu Chi Yulin: "You are crazy!" ”

"What's wrong? It must have been the big iron ball that landed first! ”

"I also know that the big iron ball landed first, but you earn the prince's money? You're not afraid to put on small shoes for the prince in the future! ”

The voice is not loud, many can be heard, after hearing this sentence, many people who are eager to try immediately did not dare to bet, indeed, the prince is not clearly sending money, if he wins the prince's money, then when he studies under the prince's door in the future......

When many people thought of this, the whole person was already bad, and many people took back the silver ticket they took out, Yu Zhiqian stared at Cheng Chumo after seeing it, this guy is really useless except for making trouble.

Holding back his anger, Yu Zhiqian took a deep breath and looked at all the students: "Rest assured, betting, this is just a small entertainment, don't take it seriously, you have won the money, and the palace has nothing to say, it is the game opened by the palace, rest assured to bet boldly, if you don't bet, you won't give me Yu Zhiqian's face!" ”

Hearing Yu Zhiqian's last words, many people looked at each other and began to bet, among which many people who drilled the camp immediately threw themselves on a pound of heavy iron balls, Yu Zhiqian stared at them: "You have to go according to your own hearts, don't bet to please the palace!" ”

Hearing Yu Zhiqian's words, Cheng Chumo, who threw five hundred taels of heavy iron balls and could land first, patted his chest: "His Royal Highness the Prince, although Chu Mo also thinks that the big iron ball lands first, but since the prince has started the game, he is confident, and Chu Mo feels that it may be a pound of heavy iron ball that lands first!" ”

After finishing speaking, five hundred taels were directly pressed on the ground of a pound of iron balls.

After hearing this, many children of the noble family lit up, Cheng Chumo is really a chicken thief, and then think about some rumors, His Royal Highness the Crown Prince is very short of money, and he once planned to move out the East Palace and sell it.

Some active-minded people immediately thought that they had stepped on the truth of the matter, and the reason why His Royal Highness the Crown Prince did this was entirely to make money, after all, His Royal Highness the Crown Prince did not charge any tuition fees when he opened the Tsinghua Garden, and it was understandable to make a little money in this way.

Many people who figured it out immediately all bet on a pound of iron balls, and some people wanted to bet on the landing at the same time, Yu Zhiqian looked at this guy: "Are you sure you think about it, don't bet indiscriminately!" ”

As soon as Yu Zhiqian said this, this guy immediately threw it directly on a pound of heavy iron balls, Yu Zhiqian nodded with satisfaction, he didn't force them to throw a pound of heavy iron balls, but they just thought backwards.

Many students who had bet on the iron ball before regretted it, but they had no money in their pockets, and looked at Yu Zhiqian: "Your Highness, I don't know if you can make an IOU?" ”

"Absolutely!"

"Then I'll chase and throw a thousand taels and one pounds of iron balls to land first!"

"Good!"

Soon fifty students, except for five poor people, the rest stole a minimum of five hundred taels, the most Cheng Chu silently invested two thousand taels, Li Bai and others only stole about fifty taels, Yu Zhiqian looked at the bet amount below, and nodded with satisfaction.

Sure enough, the things prohibited by the law are all things that make money, such as gambling, and gambling is also prohibited in the Yutang Empire, but this kind of noble family is not called gambling, it is called begging for lottery, even if it goes to the Yamen, the county order is also so, and the surrounding people do not feel that there is any problem.

"Okay, everyone's bet is done, so let's start experimenting!"

After Yu Zhiqian finished speaking, he found a guard, and after explaining, the guard immediately received the order, quickly climbed the city wall with two balls, and then stood on the edge of the city wall, raising his hands in parallel, waiting for the order.

Yu Zhiqian took out his self-made loudspeaker, and then yelled at the city tower: "Are you ready?" Thumbs up when you're ready! ”

The other guard next to the guard holding the ball immediately gave a thumbs up, and after Yu Zhiqian saw it, he nodded: "Put!" ”

After hearing Yu Zhiqian's order, the guards let go of their two hands, and the two iron balls began to fall towards the ground, and the people around them also stared at the falling big iron balls and one-pound iron balls with curiosity.

A few seconds later, both balls hit the ground at the same time.

"How is that possible!"

"That ball landed first, it won't be a pound of iron ball!"

"Let's let go, let's let go, I'll take a look, I'll take a look!"

"Isn't it? How can it be! ”

The students around the side were stunned, everyone looked at the two balls in disbelief, Li Bai relied on his skills when he was a ranger, rushed to the front with a brisk step, picked up the two balls, and carefully checked them, the two balls were determined to be the two balls just now, and they were not dropped.

"How is that possible!"

"Is there something wrong with my eyes? How can I see that both balls hit the ground at the same time? ”

The surrounding students didn't believe what they saw with their eyes at all, and they all stepped forward one by one to check the big iron ball and the one-pound iron ball, and after making sure that it was the iron ball they had just checked, they looked at Yu Zhiqian with a shocked expression.

Yu Zhiqian saw the shocked appearance of this group of people, and was very satisfied, he made money, this time he definitely made money, just now betting, the average person is about 1,000 taels, forty-five people, it should be 45,000 taels, 45,000 taels.

Tut-tut, I'll do some gambling in the future, it's not right, it's science competition, not to mention rebuilding the East Palace, it's the money to repair the palace!

"Your Highness, what's going on? This, this, this? ”

Many people looked at Yu Zhiqian, not understanding the reason, Yu Zhiqian smiled: "If you don't see clearly, you can go up and try it in person, hold your hands flat and let go at the same time, see who lands first, which of you wants to go?" ”

Yu Zhiqian definitely didn't want to climb the city gate building, from the Chang'an city gate to the Chang'an city wall, he had to walk at least a kilometer or even farther, and he had to climb the stairs.

"I'm coming!"

Li Bai was a little unconvinced, picked up the two balls and quickly ran towards the city wall, Shen Wansan moved Yu Zhiqian's stool very interestingly, and stood aside to make tea for Yu Zhiqian.

And Yu Zhiqian counted the money he earned unhurriedly, and counted the silver tickets first, broken silver or something, Yu Zhiqian is a little disdainful now, without him, there is money!

Yu Zhiqian counted the money here, Li Bai came to the top of the city wall, stretched out his two hands, and kept his hands in a parallel position as much as possible, Yu Zhiqian glanced at it, and handed his loudspeaker to Yu Chi Yulin: "You come and shout!" ”

"Good!"

Yu Chi Yulin roared, Li Bai immediately let go, and the two balls fell from the air to the ground again.

"Isn't it?"

"It's landing at the same time again!"

"What's going on?"

"It's really fake, how can a ten-pound iron ball and a one-pound iron ball land at the same time?"

Many people had doubts in their hearts, and checked the ball again, and there was still no problem with the ball.

Yu Zhiqian's heart is already happy, his experiment is to imitate Galileo's Leaning Tower of Pisa experiment, but in this time and space, about the law of free fall, his Chang'an city wall experiment will be remembered by history.

"No, I'll try!"

Cheng Chumo couldn't sit still, and ran towards the city wall with two small balls, Yu Zhiqian's face did not change at all, although this kind of physical law cannot be said to be absolutely correct, but at least for now, they can't overturn it.

Soon Cheng Chumo also did the experiment, but the result was still the same, the two iron balls landed almost at the same time, this time no one was surprised, no one exclaimed, but whispered, some people stared at the two iron balls and kept distracted.

"This can't be some kind of immortal technique used by His Royal Highness the Prince!"

"It's possible, I heard that His Royal Highness the Prince will be immortal, in the Chinese New Year's Eve, the fireworks in Chang'an City, you all saw it, that is the masterpiece of His Royal Highness the Prince, you see that the prince can make fireworks appear in the sky, and it is nothing to let two iron balls land at the same time!"

"I think so!"

“……”

Yu Zhiqian didn't care about these things, but looked at the students below: "Each of you will go on a trip and try it out for yourself!" ”

"Whoa!"

PS: There are still during the day, and I stayed up late to write! ~