On the occasion of welcoming Emperor Xian into the capital of Xu, that is, when a group of states came to congratulate, the friends of this state not only sent "coffee" and grape wine to Gao Fei and Cao Cao, but also sent a big object!

In the north of the Central Plains, due to climatic reasons, there are no large animals in the local area, but the south is not, the grass is abundant, and there is an animal that can be called the king of the land, called the elephant, the messenger of this state sent an elephant to Cao Cao, hundreds of people pulled a special wooden cart, with the whole pine wood that the two people hugged together as a wheel, and traveled thousands of miles to send this behemoth to Cao Cao's hands!

Cao Cao had never seen an elephant, and when he saw it in a huge cage, he was also horrified, and after the envoy of Fanbang explained, Cao Cao smiled and said, "I never thought that there was such a big living creature on this ground, and I Cao Mengde thought that the fat cow in Gejiazhuang was the largest animal!" ”。

When Cao Cao was young, he once let go of cows, and the joke of Gejiazhuang was just self-deprecation, when Gao Feinai said beside Cao Cao, "Meng De, don't look at this guy as a behemoth, but his temper is very docile!" ”。

Cao Cao asked, "The tall man knows this elephant!" ”。

Gao Fei nodded, in fact, this little insight of the ancients was not enough to fiddle with in front of Gao Fei, what grape wine, what elephant, "coffee", he didn't know how much he had seen in the 21st century, in fact, Gao Fei said to Cao Cao that the elephant was docile, but it was complete nonsense, of course the elephant in the zoo was docile, but at this time, the elephant in front of him was obviously wild, where would he be docile, Gao Fei just wanted to give Cao Cao a touch of mildew!

When Cao Cao heard Gao Fei's words, he looked at the elephant carefully, only to see that the animal had a trunk like a long snake, Cao Cao was so surprised that he wanted to reach out and touch the elephant's trunk!

When the elephant in the cage saw someone's hand stretched out, he snorted loudly, but sprayed Cao Cao's snot on his hand!

Cao Cao Dalu laughed, and said, "I am very happy about this thing, I will have a big banquet in the mansion today, and congratulate the ministers!" ”。

That night, Cao Cao held a banquet in Prime Minister Zeng's mansion to entertain everyone, and when Cao Cao saw that the elephant in front of him had such a huge size, he asked Yu Gao Fei, "Can you know the weight of this elephant?" ”。

Gao Fei laughed, "If Meng De asks me how heavy Gao Fei weighs, Gao Fei still has to weigh it, how will I know the ...... of this elephant", Gao Fei squinted his eyes and saw a boy of seven or eight years old breaking into Cao Cao's lap, and Gao Fei smiled and said, "In this case, why didn't Meng De ask your child Cao Chong?" ”。

When Cao Cao saw Cao Chong coming over, he smiled and said, "Lord Gao said that he was joking, how could Cao Chong know about this?" ”。

Gao Fei smiled very much, so he lowered his body and asked Cao Chong, "I don't know if Cangshu knows how heavy this elephant is?" ”。

Cao Chong shook his head, as if he was thinking, but Cao Cao smiled and said, "Children should not be like this!" ”。

Gao Fei saw that Cao Chong was speechless for the time being, so he said, "Weighing a big elephant is very simple, you only need to unload the elephant into eight pieces, and then weigh it one by one, don't you know the way!" ”。

At this time, Cao Cao said, "This elephant is a gift from the state, how can it be easily slaughtered?" ”。

Gao Fei said, "Since it is not possible to kill elephants and weigh them, then I still have a way to make a large enough rod scale, and use skilled craftsmen to build a scale that can weigh elephants, and it will be solved!" ”。

Cao Cao also frowned, but said, "With such a big pole scale, I don't know if Lu Dao can make it!" ”。

Just when Cao Cao hesitated, Cao Chong rolled his eyes and said, "Father, Cang Shu has come up with a way to weigh the elephant!" ”。

Gao Fei smiled very much, "Sure enough, the son can be taught, it's not in vain that I have to talk more here!" ”。

Cao Chong Nai said, "Please father send someone to drive the elephant out of the cage, there is a small lake in this place, and then ask father to order someone to bring a boat that can accommodate the size of an elephant!" ”。

Cao Cao was suspicious, and he didn't know what Cao Chong wanted to do, but Gao Fei on the side was full of confidence in Cao Chong, and said, "Cao Cheng is quite like the words of the son!" ”。

Cao Cao didn't think much about Gao Fei's words, so he did everything as Cao Chong said, and after the boat was ready, Cao Chong asked everyone to move to the small lake, and the elephant was also driven to the lake. ”。

Cao Chong shook his little head and said, "Exactly! ”。

At Cao Cao's behest, someone drove the elephant to the boat parked by the lake, and when the elephant got on the boat, the boat suddenly had a heavy draft, shook for a while, and then calmly placed it on the lake!

At that time, everyone by the lake was talking and said, "What does this Cao Gongzi want to do?" Someone responded, "The child is playful, it must be a joke, can he really weigh an elephant as a seven or eight-year-old child?" ”。

The elephant was already stable on the boat, and Cao Chong ordered someone to mark the position of the waterline of the hull with red, and then said to Cao Cao, "Father, you can order someone to drive the elephant back to shore!" ”。

Gao Fei said to Cao Cao, "Meng De hasn't sent someone to chase the elephant yet!" ”。

At this point, Cao Cao had not yet figured out what his little son wanted to do, and when he was hesitating, he heard Gao Fei's words and ordered someone to drive the elephant back from the ship!

At that time, Cao Chongnai smiled and said, "My lords, at this moment, as long as you move stones to the hull, wait until the waterline of the hull is on the red line drawn just now, and the weight of the stones you put on is the weight of an elephant!" ”。

When everyone heard this, they were all shocked, and after thinking about it carefully, it turned out to be the case, and they praised one after another, "The young man is really smart, very smart!" ”。

Gao Fei also said to Cao Cao, "Lord Cao really gave birth to a prodigy, so envious!" ”。

Cao Cao came back to it, and Yi Da said with a smile, "The dog is praised, not enough to mention!" ”。

According to the method Cao Chong said, after a while, he weighed a pile of stones on the scale, and after some calculations, the elephant weighed 8,000 catties, which was the weight of sixty or seventy people combined!

Cao Cao was amazed by the weight of the elephant, but he was quite proud of his youngest son's cleverness, so Cao Chong was called "supernatural", and Cao Cao loved it even more, and he didn't want to die in the mouth of the viper today!

As an aside, in fact, Cao Chong's method of calling the elephant is similar to Archimedes' law of drainage in ancient Greece, but Archimedes discovered Archimedes' law based on this, that is, the buoyancy effect on the object in the liquid is equal to the gravity of the volume of the liquid discharged by the object, of course, this is just a joke in history, but from shallow to deep, it can be compared with the ancient Chinese used gunpowder to make fireworks, while foreigners used gunpowder to make guns.