In October of the fourth year of Jian'an (199 AD), Sun Ce entered Yuzhang in the east, and Huaxin surrendered the city, so that all the counties in Jiangdong belonged to the Sun family. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 info Subsequently, Sun Ce made another big move, attacked Shaxian, broke Huang Zu, captured 6,000 warships, and drowned 10,000 soldiers, and Yunai was shocked.

Cao Cao sighed when he heard the news and said, "It's difficult for lions to compete!" He married his cousin Cao Ren's daughter to Sun Ce's younger brother Sun Kuang, and his second son Cao Zhang married the daughter of Sun Ce's cousin Sun Ben and became in-laws.

When Sun Ce heard that Cao Cao had promised to confer on him as the Great Sima, he was overjoyed and reciprocated by washing an elephant captured in Yuzhang, wearing red and hanging colors, and sending it to Cao Cao. Along the way, the gongs were sounded to open the way, accompanied by singing and dancing, so lively. The northerners have never seen such a behemoth, and there are a large number of pedestrians along the way who stop to watch and marvel. When the elephant was sent to Xudu, the people came to take a look, pointing at this "monster", and guessing how heavy this big guy was.

"You say forty or fifty healthy horses add up to one elephant?" Cao Cao listened to Sun Ce's envoy talk about how huge this elephant was, he was surprised and curious, but he couldn't believe it.

The messenger bowed and said, "Return to the prime minister." We'll just guess based on their size. This thing is too huge, according to the minister's opinion, I am afraid that no one in the world can weigh this elephant. ”

"Oh? Lonely, but he did not believe. Cao Cao was even more surprised, and asked his subordinates, "Have you ever seen an elephant, is it really so huge?" ”

All the generals had never seen an elephant, and they shook their heads one after another, but their faces were full of surprise.

"Since we haven't seen it before, let's go together." Cao Cao commanded, "Come on, Liu Yong will also ...... and Cai Yan came together. ”

At this time, the elephant had been drawn into the inner city, and ordinary people could no longer enter, but the crowd that came to see the strange was still crowded and talked about the elephant. The Prime Minister's Mansion guards separated the crowd and escorted Cao Cao and the civil and military officials into the venue. I saw that the elephant was tall and large, with four legs as thick as a tree, ears bigger than a fan, chest and abdomen like a wall, two fangs like sharp waist knives, and an ordinary adult standing in front of it, just reaching its belly, like a baby comparing a giant with a giant.

"I can't imagine that this elephant is so huge, it is really a divine beast." Cao Cao was amazed, turned his head to the crowd, "Everyone, is there a way to weigh this elephant?" ”

Everyone whispered for a while, but none of them dared to stand up. Indeed, this guy is so big, what can I call it?

Cao Cao saw that no one answered, and said hurriedly: "If you have a way to weigh this elephant, you will be rewarded with a thousand taels of gold." ”

Someone spoke up under the heavy reward, and a person said timidly: "Prime Minister, according to the opinion below, you can build a big scale, so that you can weigh it." ”

Before Cao Cao could speak, a person next to him disagreed and said, "What a big scale does this have to make!" Besides, where do you hang this scale, how heavy is the scale, and how do you calculate the weight? ”

The man was speechless, and argued, "Then what do you say?" ”

The man said: "I don't think there is any other way but to slaughter the elephant and cut it into pieces." ”

Everyone laughed for a while, and Cao Cao couldn't help laughing: "Nonsense." Isn't it a pity that the elephant was slaughtered alive in order to weigh it? He sighed and said, "Is there no one who can do it?" ”

Sun Ce's envoy on the side said: "Back to the prime minister, General Sun also offered a heavy reward, but although Jiangdong is full of talents, no one can come forward to solve the doubts. ”

"There is no one in Jiangdong, can I have no one to solve it?" Although Cao Cao was not angry in his heart, he was helpless.

Cai Wenji thought about it for a long time and didn't come up with a way, seeing Liu Yong with a smile on her face, her heart moved, pulled Liu Yong's sleeve, and said in a low voice: "I guess you already have a way in your heart, right?" ”

Liu Yong does have a way, using a pulley, a communicator, etc., but only Cao Chong's method is the simplest and most feasible.

Seeing that Liu Yong was just smiling and not answering her words, Cai Wenji was a little annoyed and angry, and pretended to threaten: "Hmph! If you don't tell me, tomorrow you will be punished for copying ten more articles. ”

Liu Yong saw that she looked like a little daughter, extremely cute, and her heart was playful, and her fingers gently beckoned. Cai Wenji hurriedly clung to it, but Liu Yong said softly: "I won't tell you." ”

Cai Wenji was so angry that she stomped her foot and waved her hand to hit. Who knew that before the hand was stretched out, Liu Yong had already walked in front of Cao Cao.

"Prime Minister!" Liu Yong bowed his hand and said.

"Chongru has a good idea, come quickly." Cao Cao said eagerly, and the feeling of anticipation was beyond words.

"Recommend one person below, and you will definitely be able to solve the confusion of the prime minister."

"Who is it? Chongru, please come quickly. Cao Cao was slightly disappointed.

"It's none other than the prime minister's beloved son, Cao Chong, the son of Cangshu!"

Everyone exclaimed, and Cao Cao was also shocked, and said in surprise: "How can Chong'er have such ability?" ”

"Prime Minister rest assured!" Liu Yong replied calmly: "Gongzi Cangshu is extremely smart, there must be a way." ”

"Quick, go get Chong'er."

After a while, Cao Chong jumped up. "Is this an elephant? It's huge! Brother Liu, how much does this elephant weigh? Cao Chong was also seeing an elephant for the first time, and he was both curious and scared.

Liu Yong took Cao Chong's little hand and said with a smile: "We also want to know how heavy he is." Chong'er, think about it, is there any way to weigh it without hurting it? ”

Cao Chong said hello, lowered his head and thought about it. Everyone held their breath, and their eyes all looked at Xiao Cao Chong, who was less than seven years old, with most of them with suspicion on their faces.

After a while, Cao Chong raised his head, his face was full of excitement, and he bowed to Cao Cao and said, "Father, the child has a way to call it an elephant." ”

When Cao Cao heard this, he was overjoyed and said with a smile: "You talk about it first, let my father hear if it makes sense." ”

Cao Chong motioned for Cao Cao to bend down, covered the corner of his mouth with his right hand, put it on Cao Cao's ear, and spoke in a whisper. Cao Cao smiled when he heard this, nodded again and again, straightened up, and said to the ministers: "Everyone, go to the river with your own appearance and see how Chong'er weighs the elephant." ”

Seeing Liu Yong's confident appearance, Cai Wenji became even more angry, and took advantage of people's inattention, twisted Liu Yong's arm, and said angrily: "Don't tell me!" Liu Yong was in pain, but he didn't dare to scream. When Cai Wenji saw him grinning with his teeth, she immediately smiled, and she was relieved.

Cao Cao led everyone to the river, and a big boat had already stopped in the river. Cao Cao said: "Chong'er, everything is ready, come on." ”

Cao Chong saluted the crowd, turned around and commanded. First, ask someone to lead the elephant to the boat, wait for the hull of the boat to be stable, and carve a mark on the side of the boat where it meets the water. Then the elephants were brought ashore, and the large and small stones were loaded into the boat one by one, and the hull of the ship sank little by little as the number of stones increased. When the stones on the ship and the weight of the elephant puller caused the ship to sink to the mark just engraved, Cao Chong ordered to stop loading the stones.

The eyes of the crowd widened, and at first they couldn't figure out what was going on, but when they saw that they had loaded the stones on the boat, they couldn't help but praise them repeatedly: "Good way!" Sure enough, it's a good way! "Now everyone understands that if you weigh every stone in the boat, the total weight added up is the weight of an elephant.

Cao Cao was naturally even more happy, he actually had such a smart son, he took Cao Chong into his arms and said with a smile: "Chong'er has good skills, Daddy will celebrate you at night, what reward do you want?" ”

"Chong'er doesn't want any reward, as long as Brother Liu and Sister Cai play with me."

"Good. Just Yi Chong'er. Cao Cao said lovingly. In his heart, Cao Cao was even a little grateful to Liu Yong, he clearly knew this idea, why did he give this brilliant opportunity to his son? Liu Yong, Liu Yong, why can't Cao guess you?

Today, Cao Chong, who is only six years old, called the elephant wonderful, which made everyone present marvel and admire, and praised him as a "prodigy", famous for a while. Cao Cao was overjoyed, and ordered a feast for Cao Chong to share the table with him as a reward. Liu Yong, Cai Wenji, Cao Pi, Cao Zhi brothers, etc., are at a separate table, although it is still a separate meal system, but thanks to Liu Yong, today's cooking methods and levels have made a qualitative leap.

"This method, can Chongru teach Chong'er before?" Cao Cao asked Liu Yong, but he still didn't believe that Cao Chong came up with it independently.

"Nope." Liu Yong arched his hand.

Cao Cao was even happier in his heart, his son was really unusually smart, so he asked Cao Chong: "Chong'er, how did you come up with the idea of using a boat to weigh the image?" ”

Cao Chong put down his chopsticks and replied, "Father, Brother Liu once told a story that is somewhat similar to today's Xiangxiang, so Chong'er thought of it. ”

"What's the story?" Cai Wenji was a little curious.

"I know that." It was Cao Zhi who spoke, with an excited face. He went to visit his friend Yang Xiu today and was not in the house, so he let his younger brother grab the jackpot, and he was really depressed, so he said: "What you have to do in that story is not only much more difficult, but also much more interesting." ”

"Oh, Zijian said to listen to it." Cao Cao was also interested.

"Yes, father." Cao Zhi gave a salute to Cao Cao and Liu Yong respectively. Liu smiled as a sign of encouragement.

"There is a country in the far west. On this day, the king of the country gave the goldsmith a piece of gold to make a crown of pure gold. This golden crown turned out to be golden and dazzling. But the king was always suspicious that the crown handed over by the craftsman was mixed with something else, but he weighed that it was indeed the same weight as the pure gold that had been handed over to the goldsmith, and that the craftsman was not a trickster. Cao Zhi's eyebrows danced, his eloquence was already excellent, and now he added a lot of his own language, taking the opportunity to show his talent, "But how to test it?" Do you want to cut this beautiful crown open? This question not only stumped the king, but also left the ministers helpless. ”

Cao Zhi deliberately paused, leaving some time for everyone present to think about it. Liu Yong secretly gave a thumbs up to Cao Zhi, Cao Zhi knew that it was a compliment, and he was even more proud in his heart.

Cao Cao squinted his eyes and thought for a while, but there was nothing he could do, and when he raised his eyes, he saw Cai Wenji holding his cheeks and thinking deeply, and Guo Jia, Xun You and other strategists who were usually brilliant in their wisdom were also at a loss, so he asked: "Zijian, you can go on." ”

"Yes, father." Cao Zhi replied, "There is a very smart man in this country called ...... What is it called. Cao Chong interjected on the side: "Archimedes! ”

"Archimedes? With such a strange name, could it be the Huns? Cao Cao was stunned.

"No, it's the Greeks." Cao Chong said again.

"The names of people outside the transformation are long, hard to remember, and very weird." Cai Wenji is familiar with history books and knows that most of the names of the Western Regions are obscure and obscure.

"That's true." Cao Cao smiled and said, "Zijian will say it again." ”

At first, Archimedes was also meditating but unable to do anything. One day, while he was bathing in the tub, he suddenly noticed that as soon as he lay down, the water level in the tub became higher, and he felt that he had become lighter; When he stood up, the water level in the basin dropped again, and he felt himself heavier again. He wondered, what is it that makes him lighter? Right! It is the water, and it is the upward buoyancy of the water that supports itself and makes it lighter. He suddenly thought of a solution to this problem, jumped out of the bathtub excitedly, and ran out without even putting on clothes, shouting loudly as he ran, I know, I know......"

Cao Cao, Cai Wenji and all the strategists are all you look at me and I look at you, but they still don't understand, so they have to listen patiently to Cao Zhi to continue. "Archimedes brought the craftsmen before the king to verify the authenticity in the presence of all the ministers. He first found two large basins, and put in each basin an identical vat, and filled the jars with water; Then the crown and the same weight of pure gold were put into the two jars, and the water overflowed into the basin. Now it's simple, just compare the amount of water in the two basins to distinguish the real from the fake. As a result, Archimedes found that the basin in which the crown was placed overflowed with more water than in the other, indicating that the artisan had adulterated the crown and was not pure gold. In the face of the facts, the craftsman could only bow his head and confess his guilt, and was severely punished. ”

Cai Wenji was the first to applaud, Guo Jia and others thought for a while before saying yes, but Cao Cao frowned and was still puzzled, and asked Liu Yong: "I still don't understand the true appearance, can Chongru explain it to Gu Shen again?" ”

"Yes." Liu Yong replied: "This principle is also called the law of buoyancy...... Liu Yong explained in detail the concepts of buoyancy, gravity, and density, the magnitude of buoyancy is related to the volume of water discharged by the object rather than its weight, when buoyancy is equal to gravity, the object can float on water. Finally, Liu Yong said: "The density of each object is a certain amount, for example, silver and copper of the same size, silver is heavier." The reverse is also true, if two pieces of silver and copper weigh equally, the copper block will be larger. In this story, this principle applies. ”

Cao Cao nodded, basically understood, but Cai Wenji asked, "What if it's hollow inside?" ”

"If it's hollow, it's not allowed. As mentioned below, the magnitude of buoyancy is related to the volume of water that the object displaces and not to its weight. ”

"According to the gentleman, then the iron can also float on the water?" It was Cao Pi who spoke who had been silent. Cao Pi didn't have much interest in science, and rarely listened to Liu Yong.

Liu Yong heard the ridicule in Cao Pi's tone, and said, "As long as this piece of iron is thin enough and made into a boat shape, it can float on the water." ”

Cao Pi didn't say anything more, but Cao Cao thought for a moment, suddenly his eyes lit up, he smiled, and muttered to himself: "So, it's okay to build an ironclad warship?" ”

Liu Yong was taken aback, I don't know if there will be a battle of Chibi in the future, if Cao Cao built an ironclad ship, it was not him who failed? (To be continued.) )