Datang: My father is the head bodyguard

In the Xiande Hall, Li Shimin showed the pencil to the ministers.

"This object was obtained by Yuchi Baoqi's collection of objects, and the production method has been handed over to the Ministry of Industry. In memory of his contribution to the treasure presentation, I temporarily named Yuchi Baoqi a man of Chang'an County. The reward will be given after the ironworks are completed. Duan Lun, you are the worker Minister, he is not of high enough rank to go to court and take orders on your behalf. Duan Lun? Duan Lun! Where are the others?"

The only living person in the Ministry of Works who replied to Duan Lun yesterday came out of work and said: "Your Majesty, the man from Chang'an County asked a question yesterday. After that, all the craftsmen in the Ministry of Works fell into deep thought. Duan Shangshu also came to the Ministry of Works after personally testing it. Sit down. When I called him to come to court this morning, the minister didn't respond at all."

Li Shimin frowned. One question caused the entire work department to stop working? He couldn't help but asked curiously: "Tell me what question that kid asked?"

"Asking whether a stone or an iron block of the same size will fall to the ground first, this is the question I am reporting to Your Majesty." An official from the Ministry of Industry informed Li Shimin of the question.

Just when Li Shimin was about to blurt out, of course the iron block hit the ground first, then he thought of his embarrassment with the pencil yesterday and thought that the entire Ministry of Works was stumped by this question, so he said: "All of you dear ministers are the pillars of the country, but does anyone know the answer?" ah?"

Cheng Yaojin quickly left work and said loudly: "I think the iron block must have fallen to the ground first. The iron block is heavy."

"Yes, yes, an iron block of the same size is much heavier, yes, that makes sense." There was a sudden echo in the hall.

Li Shimin asked: "Do any of my ministers have different opinions?"

Fang Xuanling stood up: "I thought the stone fell to the ground first. If the iron fell to the ground first, how could it put all the officials of the Ministry of Industry into such a situation? There must be an unusual reason!"

Li Shimin nodded, "If you ask me, why don't you give it a try. Come on, follow me to the Ministry of Works and see what's going on with these craftsmen from the Ministry of Works."

Li Shimin took the lead and led a group of civil and military officials to the Ministry of Industry. If Yuchi Baoqi were here, he would definitely want to sing a song of Brother Haonan's Superstar in Troubled Times. The scene was very handsome.

When we arrived at the front hall of the Ministry of Industry, there was no one, and there was no one in the middle hall. It was not until we arrived at the testing ground outside the back hall that we saw a group of craftsmen staring at Duan Lun, who was climbing up. Duan Lun was holding an iron ball and a stone ball in his hands. Comparable size.

Li Shimin watched Duan Lun release his hands at the same time, his eyes staring closely at the two balls.

"thump."

Duan Lun shouted to the people below: "Quickly tell me how many sounds of water are there? Is it two sounds?"

The craftsmen looked at Duan Lun with sad faces and only said one word. Li Shimin only heard one sound. When Duan Lun saw Li Shimin coming, he quickly came down from the height and came to Li Shimin.

"Your Majesty has arrived, but I am a little far away to greet you. I hope your Majesty will forgive me."

"Excuse me, why didn't you go to court today just to verify this? I just heard the sound of water. How could these two balls hit the ground at the same time?"

Duan Lun couldn't help but smile bitterly. Who should I ask? "Your Majesty returned to the Ministry of Industry and Commerce yesterday and learned about this issue, and he started experimenting. He thought that one of them would land first, but he didn't think of doing it all at the same time. Land."

Just as Li Shimin was about to speak, the voice of the instigator came from outside: "Duan Shangshu, have you gone to court? Why is there no one in the yamen of the Ministry of Industry? Hello, hello? Is there anyone there?"

A minister from the Ministry of Industry quickly went to invite Yuchi Baoqi in. As soon as he came in, he saw everyone looking at him with doubtful eyes. "What are you doing? Do you have flowers on my face? It's scary how you guys are staring at me."

Li Shimin walked up to Yuchi Baoqi and stared at him: "Why did they land at the same time? This is impossible!"

Yuchi Baoqi sighed: "The height is the same, the initial velocity is the same, and the acceleration due to gravity is the same. They don't just land at the same time. Forget it, just remember it like this. I don't expect you to understand."

Li Shimin was confused by his explanation: "What kind of knowledge is this?"

Yuchi Baoqi spread his hands: "I call him physics, that is, the principles and laws of all things in the world. Why does the sun rise in the east and set in the west? Why can't horses stop when they run? Why do bows and arrows project more quickly when they are shot with the same force? Far."

After hearing this, Li Shimin said: "Don't say anything else, first tell me why the horse can't stop immediately when it starts running."

Yuchi Baoqi smiled evilly and said, "Your Majesty, I don't even have a horse, so how can I answer your question?"

Li Shimin waved his hand: "Go and fetch one of my royal horses and give it to this boy."

Yuchi Baoqi immediately handed over his thanks. After a while, a black horse was brought in. This horse was completely black and only had four white hooves. It was an extraordinary horse. Yuchi Baoqi fell in love with the horse at first sight. As he looked at it, he noticed something was wrong. There was only a saddle but no stirrups. He ran over and lifted the horseshoe to see that there were no shoes on it.

"Your Majesty, you are too stingy. The horse you gave me didn't even have shoes, and it didn't even have stirrups. I wouldn't be able to fall to death while riding it."

Li Shimin was confused: "What are you talking about? What are horseshoes and stirrups? I gave you a royal horse and you complained about me?"

Yuchi Baoqi remembered that horseshoes were not widely used in the Central Plains before the Song Dynasty. The main reason was that the terrain was flat. Most of the ancient horseshoes excavated by later generations were in mountainous and hilly places such as Goguryeo and Dawan.

"Your Majesty, wait a moment. Some craftsmen who are good at blacksmithing will come. Bring the iron materials and follow me." He said and left with the craftsmen.

After a while, he came over with four forged horseshoes and short nails, and directed the craftsmen to hold the horse's legs and shoe the black clouds on the snow. After nailing, they hung the stirrups on the saddle.

Just when Li Shimin wanted to go out for a ride and try it out, Yuchi Jingde got there first: "Your Majesty, the new thing is not safe, as my son said. I am your number one bodyguard. I will try it first. You are in charge of safety." After saying that, he got on his horse and drove away.

Yuchi Jingde walked along a gravelly road, and after completing a lap, he stood in the stirrups and rode back.

"Your Majesty! I walked on gravel roads all the way, and the horse didn't seem to be affected at all. This stirrup is also a good thing. I can stand on it. If I draw my bow and nock an arrow, it will be very stable!"

Li Shimin watched with his own eyes as various generals went to check the horseshoes. They found that there was no wear at all, and he was very happy!

"Wei Chi Baoqi listened to the decree. Today, a man from Chang'an County presented a horse with iron hoofs and stirrups. He was promoted to the son of Chang'an County and was rewarded with a thousand acres of fertile land and food for [-] households."

"I accept the order!" Although Yuchi Baoqi didn't know when he became a county man, he accepted it first and then talked about it.

What everyone doesn’t know is that from today on. There are countless people betting on the streets, teahouses, and restaurants, and the content of the bets is the same: "Who do you think will land first?"

If you know it, you will smile. If you meet someone who doesn't know, you will inevitably find a place to verify it.

In the end, Li Shimin had to put up a notice to inform the people of the farce when two balls landed at the same time.