When Sima Qian, the author of Historical Records, wrote the history of the soul country during the Warring States Period. It is said that in order to destroy Wei, Qin led the Yellow River to flood the capital of Wei. In order to find out this historical fact, he personally went to the wall of Daliang, climbed high and low, searched for traces of that year, and patiently investigated with the local elderly. Finally, he mastered a lot of information and confirmed that Qin really led the Yellow River to flood Daliangcheng, and then wrote this historical fact into Historical Records.
2./kloc-in the 0/8th century, smallpox spread in Europe and Asia like a terrible plague. Almost everyone in Britain will catch this disease sooner or later. Many adults have ugly scars left by smallpox on their faces and bodies. Thousands of people are blind or crazy because of their serious diseases, and countless people die every year. Jenner, the discoverer of immunity, was a young engineer at that time. He is determined to fight smallpox.
Through observation and experiment, he found that artificial inoculation of vaccinia on animals can prevent smallpox. So, what are the experimental results in people? At the risk of possibly killing her son and enduring all kinds of censure from relatives and friends, Qin Na planted smallpox slurry on her son's arm, and two months later, she planted the pus of smallpox patients on her son. As a result, his son was not infected with smallpox and the experiment was successful.
3. In the first year of Liang Wudi's founding (BC 140), Liang Wudi wanted to unite with Da Yue to attack the Huns, and Zhang Qian was recruited as the envoy. Jianyuan went out of Longxi in three years, was captured by Xiongnu, and then fled. I went west to Dawan, passed Kangju, arrived at Dayue's home, and then went to Daxia, and stayed for more than a year before coming back.
On his way home, Zhang Qian changed from South Road to Nanshan in an attempt to avoid being discovered by Xiongnu, but he got it from Xiongnu and was detained for more than a year. In the third year of Yuan Shuo (BC 126), the Huns were in civil strife, and Zhang Qian took the opportunity to escape into the Han Dynasty. He gave a detailed report on the Western Regions to Emperor Wu of Han Dynasty, who made him a doctor in Taichung.
Because of Zhang Qian's prestige in the Western Regions, the envoys of the Han Dynasty later called him Bo Wanghou to win the trust of other countries. Zhang Qian has made outstanding contributions to the opening of the Silk Road from China to the Western Regions, which is praised by the world.
4. In the orchard at home, a man accidentally bumped into an apple tree in the orchard because he was thinking while walking. At this moment, an apple just hit Newton's head. Newton suddenly woke up from the problem and picked up the apple. At this time, he fell into another problem: why did the apple fall to the ground instead of floating in the sky? Finally, Newton put forward a universal law of the simplest phenomenon: gravity.
Once, Einstein wanted to replace an old painting on the wall, so he moved a ladder and climbed it step by step. Suddenly, he thought of another question, meditated, forgot what he was doing and suddenly fell off the ladder. After falling to the ground, he ignored the pain and immediately thought: Why do people fall straight?
It seems that objects always move along the path of least resistance. Thinking of this, Einstein immediately stood up, limped to the table, picked up a pen and wrote down his thoughts. This is a great inspiration to the problem he is studying-relativity.