1, Thales: measuring pyramids skillfully
Thales saw that people were reading the notice, so he went to check it. The initial notice said that Pharaoh wanted the smartest person in the world to measure the height of the pyramid. So I went to Pharaoh.
Pharaoh asked Thales what tools he used to measure the pyramids. Thales said he only used a stick and a ruler. He put the stick next to the pyramid. When the shadow of the stick was as long as the stick, he measured the length of the shadow of the pyramid and half the length of the bottom of the pyramid. Add these two lengths to get the height of the pyramid. Thales is really the smartest man in the world. He can easily measure the height of the pyramid without climbing to the top.
2. The story of Archimedes
The king made a golden crown. He suspected that the craftsman had stolen some gold with silver, so he asked Archimedes to identify whether it was made of pure gold and not to damage the crown. Archimedes thought hard about the crown all day. One day, Archimedes went to the bathroom to take a bath. He went into the bath tub. When he immersed himself in the bath bucket, some water overflowed from the side of the bucket. When Archimedes saw this phenomenon, the lightning flashed in his mind: "I found it!" "
Archimedes put an equal weight gold nugget and a silver nugget into a container filled with water, and found that the silver nugget discharged much more water. So Archimedes took a gold nugget with the same weight as the crown and put it in a container filled with water to measure the displacement; Then put the crown in a container filled with water to see if the amount of water discharged is the same, and the problem will be solved. With further research, Archimedes principle, the most important cornerstone of fluid mechanics, was born.
Second, the National Day information
People's Republic of China (PRC) National Day is also called National Day, National Day, National Day, National Day, China National Day and National Day Golden Week. The Central People's Government announced that from 1950, 65438+ 10/0/day every year is the day when People's Republic of China (PRC) was proclaimed as a national day.
Origin:
The inauguration ceremony of the Central People's Government of People's Republic of China (PRC), namely the founding ceremony, was held in Tiananmen Square. ?
"The first person who proposed' National Day' was Mr. Ma Xulun, then a member of the CPPCC and the chief representative of Democratic Progressive Party."
10 On 9 October, the first National Committee of China People's Political Consultative Conference held its first meeting. Commissioner Xu Guangping spoke: "Commissioner Ma Xulun can't come on leave. He asked me to say that the establishment of People's Republic of China (PRC) should have a national day, so I hope this Council will decide to designate 10+ 1 as the national day. " Commissioner Lin also made a speech, seconded it and asked for discussion and decision. On the same day, the meeting passed the motion of "asking the government to designate October 1st as the National Day of China people to replace the old October 10th National Day" and sent it to the Central People's Government for implementation.
1949 65438+On February 2, the resolution adopted at the fourth meeting of the Central People's Government Committee pointed out: "The Central People's Government Committee hereby declares that People's Republic of China (PRC) is a great day for the people of China from 1950 every year, that is, 10."
Extended data:
The evolution of National Day holiday;
In the early days of the founding of New China (1950─ 1959), large-scale celebrations and military parades were held every National Day.
1960 In September, the Central Committee and the State Council decided to reform the National Day system in line with the principle of building the country through diligence and thrift. Since then, from 1960 to 1970, a grand assembly and mass procession have been held in front of Tiananmen Square every year, but no military parade has been held.
From 197 1 to 1983, every year, 10 and 1, Beijing celebrates the National Day in the form of large-scale garden parties, and there are no mass demonstrations. 1984, the 35th anniversary of the National Day, held a grand National Day military parade and mass celebration parade. In the following ten years, other forms were used to celebrate the National Day, and no national day military parade and mass celebration parade were held.
1999 10 1, the 50th anniversary of the national day, held a grand national day military parade and mass celebration parade. This is the last grand National Day celebration held by the people of China in the 20th century.
Baidu Encyclopedia-China National Day