2.1921June 6, 2006 16, Hu Shi first proposed "punch card shop" in the preface to Wu Yu Lu Wen. Since then, this slogan has been widely used in the New Culture Movement and evolved into "Down with Kongjiadian". Its practical significance is to overthrow Confucius, Confucianism, post-Confucianism and ethics.

3. 1921May19, US President Harding signed the immigration law. The bill stipulates that the number of immigrants is limited to 3% of the number of foreign-born groups in the United States in 19 10. After the implementation of the immigration law, the number of immigrants to the United States decreased rapidly.

4.1921March 3 1 day, British coal miners started a three-month general strike. British miners hate and fear mine owners. They welcome the wartime government's takeover of mines, because it means long-term employment and wage income, as well as strict enforcement of safety regulations. However, now the government has decided to return the coal mine to the mine owner and refused to nationalize it. The miners objected to this decision, so they held a national strike on March 3 1 and didn't resume work until July 1 when the government agreed to subsidize the coal mining industry.

5.1921February 9, the living Buddha of Mongolia declared the independence of outer Mongolia.

6.1921On July 27th, Canadian doctor Frederick G. Wanzin and his collaborator Charles Best isolated a substance from the pancreas of dogs, which can eliminate the fatal symptoms of diabetes. This extract was named insulin by Dr. John mcleod of the University of Toronto. The doctor encouraged Wan Jin and provided him with a laboratory. Insulin is expected to save the lives of many diabetic patients. Although they all strictly control their diet, they still face the threat of slow death. Insulin beneficial to diabetic patients is expected to be used soon.