To play mahjong, of course, there must be mahjong.

Uncle Jim brought back forty-eight pairs of mahjong from Shanghai, of which nine pairs of mahjong had to remain at the club, and the maximum number of mahjong sold to mahjong friends was thirty-nine.

Thirty-nine pairs of mahjong obviously can't meet the growing demand, Uncle Jim, who has been in China for a while, he has a channel to buy in China, he said that new mahjong is being shipped from Shanghai, please be patient.

Mahjong is a game invented by the Chinese, and the promotion and sale of mahjong should be done by Chinese who are proficient in mahjong.

Li Kangping left the club and immediately went to New York's Chinatown to find out about the situation.

The Qing Dynasty is dead, but there are still a small number of Chinese men in Chinatown who wear their hair in braids. The same is true in China, there are also braided soldiers, and there are also braided scholars such as Gu Hongming who look forward to the return of the Qing Emperor.

This Hui Kee grocery store in New York's Chinatown is a store frequented by Li Kangping, who buys something and talks to the uncle.

Before the Xinhai Revolution, Chinatown was almost isolated. After the Xinhai Revolution, Chinatown changed, the number of braids was drastically reduced, young women stopped binding their feet, and the number of Chinese children sent to nearby American schools gradually increased.

Although it has become more and more open, Chinatown, or Chinese Americans, has not yet fully integrated into mainstream American society.

Li Kangping learned that mahjong had come to New York's Chinatown decades ago.

Chinese people occasionally play mahjong, but they never think of promoting mahjong in the United States.

Advertisements for the White Brothers Mahjong Club appear in the newspaper every day, uncle, you never read the newspaper?

"The promotion of mahjong by white Americans is more effective than that of Chinese Americans." The uncle said, and he added: "The sudden whim of white Americans to play mahjong is nothing more than a gust of popularity, which will soon dissipate." ”

The uncle was not optimistic about the prospects of mahjong in white American circles, and Li Kangping took his leave and waited for the mahjong sent by his father from Guangzhou to arrive in New York.

Bachelor's degree certificates and graduate school admission qualifications are related to the fate of a student, so the review process is relatively lengthy.

Li Kangping waited, he waited for two US presidents, and finally waited for the news of Columbia's bachelor's degree and Columbia University's graduate school.

On March 4, 1921, President Wilson ended his term and the new President of the United States, Warren Harding, was sworn in.

Warren Harding was very handsome, his face and posture showed the nobility and dignity of Washington, he was very photogenic, and his photographs in the newspapers won people's love and respect. Yes, Warren Harding looks like the president of the United States.

Warren Harding delivered the presidential inauguration proclamation on radio from the White House, and Americans heard the following words on the radio: "I will work with you to usher in a new era of greater sobriety and efficiency!" God bless America! ”

On the day of President Harding's inauguration, Li Kangping received a bachelor of science degree from Columbia University and an offer from the Department of Physics at Columbia University's graduate school.

"Lee, this is your bachelor's degree certificate, we can't hold a graduation ceremony for you alone, you will be attending the spring graduation ceremony at the end of May." Mr. MacDonald handed over his diploma.

Li Kangping solemnly accepted the Bachelor of Science degree from Columbia University, which was a beautiful and solemn page, inlaid in a frame, and the current president of Columbia University signed the certificate.

"Thank you, Mr. MacDonald!" Li Kangping's mood was quite excited, he graduated again, and graduation was always gratifying.

The graduation certificate of Columbia University alone is very ceremonial, and the graduation ceremony of Columbia University is a grand ceremony. Li Kangping will attend the graduation ceremony at the end of May, as a master's student.

The admission letter for Columbia graduate students is relatively simple, it is an ordinary piece of paper, and it conveys the message: Mr. Li, your master's supervisor is Professor William Woodgate, please move into the master's dormitory before March 20 and report to Professor Woodgate.

The Columbia University Graduate School did not provide a scholarship to Li Kangping, and his tuition and accommodation fees for his master's degree will be paid by the Geng Foundation.

Columbia University's master's dormitory is located at the northernmost part of Columbia University's campus, and Li Kangping's master's dormitory is also a single room, with a dormitory structure and area similar to that of his undergraduate students, with the only obvious difference being that the bed is much larger.

More than a month after the publication of "Blackbody Radiation and Quantum of Light", Li Kangping found that his paper did not seem to have attracted wide attention from the American physics community.

Arthur Compton wrote a letter to Lee Kangping, and Professor Woodgate offered him verbal praise, and that was it.

Li Kangping has not yet received a notice of admission from APS or the American Association for the Advancement of Science (AAAS), and he feels that he may not be able to become a full member of APS or AAAS anytime soon.

On March 6, Li Kangping came to the Hertley House to report to Professor Woodgate.

There was no grand welcome party, Li Kangping came, got to know the team members, and then began to learn the materials and familiarize themselves with the environment.

Professor Woodgate said: "Mr. Alan Biederman, my master's student. ”

When Allen helped Li Kangping move things to the master's dormitory yesterday, he learned that Li Kangping was under Professor Woodgate.

Li Kangping had long known that Allen's master's supervisor was Professor Woodgate, and the two smiled at each other, shook hands and went through the motions.

The three-person team is undoubtedly led by Professor Woodgate, whose lab is located on the easternmost side of Columbia's campus, in a separate building that looks like a small workshop.

Professor Woodgate said that his laboratory was originally used as a glass workshop at Columbia University to manufacture glass instruments for teaching and research at the university. A few years ago, Columbia outsourced the business of glass instruments, and Professor Woodgate took over the glass factory and transformed it into a physics laboratory for high-end physics.

"This is our electric furnace and vacuum pump, and the silver particles are heated in a vacuum environment to obtain a free-flying beam of silver atoms." Professor Woodgate took two students to learn about the experimental equipment, and he mainly talked to Li Kangping, who was just a newcomer.

"The area through which the silver beam passes must always be in a high vacuum of 10 to the minus 5th power, and the other end of the vacuum system is cooled so that the silver beam condenses on the receiving glass plate. If we observe that the silver atomic beam splits into two bundles in the inhomogeneous direction in the inhomogeneous magnetic field, and we measure that the magnitude of the atomic moment component is equal to one Bohr magnet, then it means that the atoms cannot be arbitrarily oriented in the magnetic field, which proves the validity of space quantization. Professor Woodgate stood in front of the glass plate and explained the purpose of the experiment.

The core idea of this experiment is to have a beam of silver atoms bombard the glass plate and deposit it there, and the results of the imaging of the silver layer will determine the victory or defeat of Woodgate's team.

Li Kangping observed that in the laboratory, there were electric stoves, vacuum pumps, air extractors, glass plates, and baffles made of platinum sheets, sewn diaphragms, and brass boxes...... These devices are combined into a set of experimental equipment according to a certain law, and the set of experimental equipment that Li Kangping saw with his own eyes is basically consistent with the experimental design drawings he drew on paper.