1, stealing light:

When Kuang Heng was a child, he liked reading very much, but his family was poor and he couldn't afford it. Therefore, Kuang Heng went to work for a rich family and asked them to lend him books for free.

A few years later, Kuang Heng grew up and became the main labor force in the family. He works in the field all day, and only has time to read a little book during his lunch break, so it often takes ten days and a half months to finish reading a book.

Kuang Heng was in a hurry, thinking: planting crops during the day, no time to read, you can spend more time reading at night. But Kuang Heng's family is very poor, and he can't afford to buy oil for lighting. what should he do ？

One night, Kuang Heng was lying in bed reciting the books he had read during the day. Behind me, I suddenly saw a light coming through the east wall. He stood up and went to the wall to have a look. Ah, it turned out that the neighbor's lamp came through the crack in the wall.

So Kuang Heng thought of a way: he picked up a knife and dug several cracks in the wall. In this way, the light coming through is also very big, so he gathered the light coming through and began to read.

2. Sima Guang smashed the cylinder:

Once, Sima Guang and his friends were playing in the backyard. A child climbed into the vat and fell into the water. When other children saw something was wrong, they gave up and fled in panic, but Sima Guang used his quick wits to pick up a big stone from the ground and slammed it into the water tank. The water gushed out and the child was saved.

3, Kong Rong let pear:

When Kong Rong was four years old, he ate pears with his brother, always eating small ones. Someone asked him why he did it. He replied: "It is reasonable for children to eat small."

4. Cao Chongxiang:

The elephant is too heavy to be weighed. Cao Chong thought of a way to take the elephant to a boat, write down the sinking marks of the boat, and then replace the elephant with stones, so that the boat sank to the same position. Finally, the weight of the stone is the weight of the elephant.

5, hope plum to quench thirst:

Once Cao Cao went out with his troops, and there was no water on the way, so the soldiers were very thirsty. So Cao Cao asked his men to send a message to the soldiers, saying, "There is a large piece of Meilin in front, bearing many plums, which are sweet and sour and can quench your thirst." Hearing this, the soldiers all drooled. With this, they can reach the place where there is water ahead.