Zhao Kuo studied the art of war since he was a child, and when it comes to fighting, he thinks that no one in the world can beat him. Zhao Kuo once talked with his father Zhao She about fighting soldiers. Zhao couldn't refute him, but Zhao didn't say he was good either. Zhao Kuo's mother asked Zhao She why, and Zhao She said, "Fighting is to save lives, but Zhao Kuo made it easy. If Zhao doesn't let Zhao Kuo be a general, forget it. If he must be a general, then it must be Zhao Kuo who destroyed the Zhao army. "

Zhao Kuo immediately replaced Lian Po as anti-Qin general, changed all the original disciplines and regulations, replaced and rearranged officers. General Qin heard about these things, sent unpredictable troops, pretended to be defeated, cut off the road of Zhao's army to deliver rations, split Zhao's army in two, and the morale of the army was scattered. After more than forty days, the soldiers in the army were hungry, and Zhao Kuo personally led a good soldier to battle. Qin Jun shot Zhao Kuo. Zhao Kuo's army was defeated, so hundreds of thousands of soldiers surrendered to Qin, who buried them alive.

Galileo's story

Before Galileo, Aristotle in ancient Greece thought that the speed of falling objects was different. Its falling speed is proportional to its weight. The heavier the object, the faster it falls. For example, an object weighing 10 kg falls 1 0 times faster than an object weighing1kg.

Since 1700 years ago, people have always regarded this theory that violates the laws of nature as an indisputable truth. Young Galileo boldly questioned Aristotle's theory based on his own empirical reasoning. After careful consideration, he decided to do an experiment by himself. He chose the Leaning Tower of Pisa as the experimental field. On this day, he brought two iron balls with the same size but different weights, one of which weighed 100 Jin and was solid; The other one weighs 1 kg and is hollow. Galileo stood on the leaning tower of Pisa and looked under it. The tower was crowded with people who came to watch, and everyone was talking about it. Someone sarcastically said, "This young man must be crazy! Aristotle's theory cannot be wrong! " The experiment began. Galileo took an iron ball in each hand and shouted, "Look carefully, people below, the iron ball is going to fall." With that, he opened his hands at the same time. People saw two iron balls falling in parallel and falling to the ground almost at the same time. All the people were dumbfounded. Galileo's experiment revealed the secret of falling body movement and overthrew Aristotle's theory. This experiment is of epoch-making significance in the history of physics development.