Liu Yong said: "Liu Yong has always disliked it, and he is clumsy in government affairs. Pen & Fun & Pavilion www.biquge.info If you just come up with some ideas, you can't govern the state and county. Although these are Liu Yong's shortcomings, they are the strengths of his brother. Brother Bo cherishes the people, worries about the country and the people, and it must be a blessing for the people of Luoyang to have you in power. This is also why Liu Yong strongly recommended you to the prime minister to serve as the Luoyang Commander. ”

Wei Qian was extremely moved, choked up and couldn't speak, arched his hand and said, "Wei is deeply sorry for the general. The two have similar views, these days the two have worked together, cooperated tacitly, complemented each other, and governed Luoyang in an orderly manner.

"Brother Bo Ji doesn't have to worry about Liu Yong. Didn't the edict also say that Liu Yong would go back and have another appointment. ”

Wei Qian calmed down a little and asked: "The other Wei Mou is not worried, but now all walks of life outside Guanzhong and Guanzhong are divided, and they dare not move lightly because they are afraid of the prestige of the general." It's a pity that these people only obey on the surface, but secretly recruit troops and horses, increase their strength, and in the long run, they are only afraid of the disaster of swords, dare to ask General Wei how to deal with it? ”

Liu Yong was stunned, isn't this your strategy, why did you ask me instead? He smiled and said, "I see that these people all seem to be powerful, but none of them have big ambitions." It is better to write to the court to give him a knighthood and a reward depending on the size of his army. Seeing that the titles they have received are different and the rewards are different, these people will definitely be suspicious of each other, and even fight each other and kill each other. At this time, the imperial court saw the time and decisively dispatched troops, and it was easy to cut them off. If they sit back and watch them become bigger and stronger, and the imperial court sends troops to clean them up, it can only urge them to unite, and the situation will be even more difficult to control. ”

Wei sighed: "Wei also asked the superior to do this earlier, but he was humble and contemptuous in the lower position, and no one accepted it. General Liu was deeply appreciated by the prime minister, and asked the general to turn back to Xu Du and offer this strategy to the prime minister. ”

Liu Yong knew the intention of Wei to ask about this matter at this time, and nodded deeply and said: "Liu Yong will know the benefits and disadvantages when he sees the prime minister, so as to ensure the smoothness of the customs and no longer fight with swords." ”

Liu Yong handed over the letter to Wei Qi and cleaned it up slightly. did not alarm others, only took the people of the headquarters to escort Cai Wenji back to Xudu. The people of Luoyang heard from nowhere that Liu Yong wanted to go back and help the old and the young. took melons, fruits, wine and food to the gate of the house to say goodbye, but was told that Liu Yong had gone on the road as early as midnight, and everyone had to lean over and bow in the direction where Liu Yong was going, sighing.

Cai Wenji saw Cao Cao and talked about Cai Yong's grievances. What happened to him, he couldn't help crying bitterly, and Cao Cao couldn't stop crying. Now that Cai Wenji has finally returned to her homeland, it can be regarded as a bittersweet end, and Cao Cao can't help but be overjoyed. Thinking about Cai Wenji getting along with Liu Yong in the past few months, Cao Cao asked, "What does Xian Mei think Liu Yong is a talented person?" ”

Cai Wenji replied: "Little sister thinks that Liu Yong's knowledge is unfathomable. ”

Cao Cao said with a smile: "Sister Xian is too modest, who doesn't know that you are erudite and talented, and you are through the past and the present." It is rare in the world, how can it be compared to Liu Yong? ”

"Xiaomei is not humble, she just thinks it is strange. The food made by Liu Gongzi, the soap used for bathing, and even astronomy and geography, the little sister read a lot of books, but she didn't find half of the source. ”

Cao Cao smiled: "Sister Xian, don't you know that Liu Yong is from the Western Regions? Nature is different from the Central Plains. ”

Cai Wenji shook her head and said, "Little sister was suspicious of Liu Yong's statement that he was from the Western Regions. If there was already such a technique in the Western Regions, why didn't Zhang Qian and Ban Chao record it? How could the countries of the Western Regions be willing to lie dormant under the wings of the Great Han and not dare to move? ”

Cao Cao nodded and said, "Sister Xian is reasonable. Chong'er's question is tricky and weird, and tomorrow she will pick up the wind and wash the dust for the virtuous sister. What is the response of Liu Yong? ”

Liu Yong was the first time he met Cao Cao's sons. The first is the eldest prince Cao Pi, who is eighteen years old this year, walking with his head held high and his air high. An old look. Liu Yong didn't like Cao Pi very much, but he couldn't admire this person's talent, and he first set up the nine-product Zhongzheng system, under his governance, the Wei society was stable and the people were happy. The national strength is getting stronger and stronger, and he sighs that Cao Cao has a unique vision to pass on his career to this person. The second is the third son, Cao Zhi, who is only fifteen years old now, Yushu is in the wind, chic and elegant, and he is a beautiful son. Liu Yong was quite close to Cao Zijian, who Xie Lingyun of the Southern Dynasty commented that "there is only one stone in the world, and Cao Zijian monopolizes eight buckets", but he also felt that Cao Zhi, a person with strong romanticism, should only be placed in the countryside, not in the political power. Cao Chong is Liu Yong's favorite, this extremely smart little prodigy is only five years old, very thin, but his eyes are smart, he talks a lot, and he keeps asking questions.

Cao Cao smiled: "Isn't Chong'er really wondering if the sun is closer to us in the morning or the sun is closer to us at noon?" ”

"yes. Can Daddy tell Chong'er? Cao Chong said excitedly.

"Just ask this person." Cao Cao pointed at Liu Yong.

Cao Chong jumped up in front of Liu Yong and asked with a happy face, "Can Mr. tell Chong'er?" ”

Liu Yong was happy in his heart, isn't this the "Two Children's Debate" that he learned before? These questions may have been difficult for the ancients, but they are trivial for an intellectual who has come out of a regular university.

Liu Yong smiled and said, "Actually, the sun at noon and in the morning is as close to us as it is. ”

Cao Chong was stunned for a moment and asked, "Then why is the sun so hot at noon and so cold in the morning?" Isn't it hot when it's close and cold when it's far away? ”

"Excuse me, sir. Why do we see the sun so much in the morning than at noon? Isn't it getting bigger the closer you go? Cao Zhi also asked.

"Either the sun is bigger in the morning or the sun is bigger at noon, how can you say that it is the same as sir, what is the reason?" Cao Pi looked like he was looking at Liu Yong's jokes.

Everyone sitting here also thought that either the sun was bigger in the morning or bigger at noon, but no matter which one was bigger, it seemed unreasonable, but Liu Yong's answer was just as big, and it was even more unexpected for everyone. Anyway, everyone was at a loss, so they looked at him and listened to what he had to say.

"Let's start with the size of the look." Liu explains, "Why does the sun look bigger in the morning than at noon? When the morning sun rises from the ground, it is surrounded by trees, houses, and distant mountains, and is set against the backdrop of these scenes. At noon, the sun rises high and behind it is a vast expanse of the sky, and there is nothing to compare with it, so the sun is small. In fact, the sun looks big in the morning, and there is an amplification effect of the atmosphere, but this knowledge is too profound for people at the time, so Liu Yong directly filtered it.

Cao Cao and Cai Wenji glanced at each other and shook their heads together, still as if they understood or not. This is still true of these two people, not to mention the children. Cao Cao coughed lightly and said, "Chongru, is there any easy way to verify it for us?" ”

"Prime Minister, my other method is very intuitive." Liu Yong replied.

"Chongru, come on."

Liu Yong was confident and said to Cao Cao: "Annoying Prime Minister, Liu Yong wants to ask for a few copper coins of different sizes and borrow paper and pencil for use." ”

Cao Cao made a move, and without much effort, the waiter brought the paper, pen and copper coins to the square table next to him, and Liu Yong walked over and drew three or five times. After a while, Liu Yong came over with the two corners of the paper and showed it to everyone.

I saw that the picture was divided into left and right, and there were other circles around one circle, but the circle on the left was larger, and the circle on the right was smaller. Everyone didn't know what was going on, and they all looked at Liu Yong inexplicably.

Liu Yong smiled slightly, and asked Cao Chong first: "Does Gongzi Cangshu think that the circle in the middle is bigger on the left or bigger on the right?" ”

Cao Chong was slightly stunned, looked at it carefully for a while, and said, "Chong'er thinks the one on the right is bigger." ”

Liu Yong turned around and asked the others in turn, and everyone replied that the one on the right was bigger.

Liu Yong was triumphant and said with a smile: "It's all wrong." In fact, these two circles are the same size. ”

Everyone didn't believe it, but it was clear that the one on the right was much bigger. Cao Pi took the copper coin mold used by Liu Yong to paint and made a seal, and sure enough, the two circles were the same size. Everyone was surprised to see this result, and they were even more puzzled in their hearts.

"Actually, it's just an illusion. An object of the same size appears small when placed in an object larger than it, and large when placed in an object smaller than it. This is where the difference between the morning sun and the midday sun lies. Liu Yong explained, "Besides, why does it feel like the sun is hotter at noon?" This is due to the fact that the morning sun is oblique to the earth, while the noon sun is directly on the earth, and the light and heat gathered together are more and stronger. Liu Yong explained while using candlelight to make the sun and oranges to make the earth for demonstration.

This phenomenon is relatively obvious, and everyone has no objections, but Cao Zhi saw Liu Yong holding a round ball compared to the earth, so he asked strangely: "The ancients are cloudy, the sky is round and the place is round." Did Mr. Fei think that the earth was also round? ”

"Indeed, our earth is round."

"Oh." Cao Cao was also surprised at this time, and asked, "What credentials does Chongru have?" ”

"Prime Minister, the sea is huge?" Liu Yong had read Cao Cao's "Watching the Sea", so he asked this question.

"There are thousands of rivers in the world, and the water they carry is innumerable, but they are poured into the ******, but there is no profit or loss with the naked eye. The sea is so big and boundless that it can hold all things. Cao Cao was deeply touched.

"Prime Minister, if the earth is flat, then the sea should also be flat, right?" Liu Yong asked again.

"That's nature."

"Liu Yong, please recall, when the prime minister sees the ship returning from afar, which part of the ship did you see first?"

None of the others had seen the sea, so they looked at Cao Cao with anticipation, with a look of eagerness. Cao Cao stroked his beard, closed his eyes slightly, indulged for a while, opened his eyes, smiled at Liu Yong, and said, "What Chongru said is indeed reasonable. ”

Cao Pi was a little puzzled, "Daddy, do you mean that the ground under our feet is really round?" ”

Cao Cao was also a little confused, "I don't know if it's round, but it must not be flat." ”

"Why does the gentleman say that you can see which part of the ship first to know if our earth is round?" Cao Chong also asked. (To be continued.) )

PS: Note: The rankings of Cao Pi, Cao Zhi, and Cao Chong in this book are different from those in historical books, and they are all slightly older than they actually are.