The temperature is getting colder and colder, and it's November.

On November 2, 1920, President Wilson, who was seriously ill, gave up his re-election campaign, and two little-known politicians, Warren Harding and James Cox, announced their candidacy for the presidency, while Mr. Henry Ford, who was deeply loved by the American people, did not appear on the presidential list.

On the same day, the world's first civilian radio station opened in Pittsburgh, called KDKA, operated by Westinghouse.

It is not difficult to deduce that since there are civilian radio stations, the demand for civilian radios must surge.

The university campus has always been at the forefront of science and technology, and the official operation of KDKA has made electromagnetism quickly become a popular course at Columbia.

Li Kangping had already registered for the electromagnetism course in September, and in September and November, the classroom of the electromagnetism course, which can accommodate more than 100 people, had an occupancy rate of 30%, and less than 40 students had registered for electromagnetism.

However, in November, the classroom of the electromagnetism course was actually full of students, and the students who did not get a seat sat on the ground, standing at the door, stretching their necks and tilting their heads, which was very lively.

"Damn, it's too late!"

Li Kangping arrived at the classroom at about 9:05 as usual, but today was not as good as before, all the seats in the classroom were occupied, and Li Kangping had no choice but to sit on the steps.

"People who haven't registered for electromagnetism are making a lot of fun." Li Kangping whispered.

In a seat in the aisle near the staircase, a handsome white blonde student retorted, "That can't be said, we have the right to sit in on any public class." ”

Li Kangping nodded and said, "That's right, wherever the radio waves go, all living beings are equal. ”

The white boy smiled slightly, but was not annoyed, and said, "You are really good at using Siegfried sarcasm." ”

Every student at Columbia University has the right to attend classes, and even if you are not registered in electromagnetism, you can still audit public courses in electromagnetism, but you can't participate in extracurricular seminars and get credits in electromagnetism.

At nine o'clock, the electromagnetism teacher walked through the wall, walked to the blackboard, and began the class.

Like many Italians, Professor Luca Pazzini, with melancholy eyes and a thin upper lip, noticed that the number of students who took his electromagnetism course had skyrocketed several times, and he knew that the popularity of electromagnetism was partly due to the vividness of his lectures, and partly to the ever-changing external environment.

Professor Pazzini did not take special care of the auditors, who were several times larger than the registered students, and he taught according to the syllabus that had already been set.

How else to say that the temporary auditors joined in the fun, these whims missed the first two months of the electromagnetism course, and they really understood Professor Pazzini's lecture at this time?

Maxwell came up with the idea of radio waves in 1860, but it wasn't until 1882 that radio waves were discovered by Hertz through ingenious experiments. In those days, Lord Kelvin opposed the doctrine of radio waves, and Helmholtz encouraged people to try it. As a result, the radio waves that the British thought of, but the Germans were the first to find out! Until now, the angry British are complaining, they say that Lord Kelvin is to blame for finding out the credit for finding out the radio waves that was robbed by the Germans! Gentlemen, what does this example illustrate? This shows that theoretical assumptions are important, and accurate and feasible experiments are equally important! ”

Professor Pazzini talked and talked about the popular science content of the first class of the semester for some reason.

Li Kangping sighed softly, hey, the magnificent academic ideals can't withstand the real performance appraisal after all, Professor Pazzini gave in, and he still took care of the temporary auditors to ensure that the students flocked to the crowded public class teaching scene.

In response, the number of seminars for registered students in electromagnetism has been increased from once a week to twice a week, and Professor Pazzini has personally participated in the seminars, which has greatly improved the quality and efficiency of the seminars.

That night, after the extracurricular seminar on electromagnetism, Li Kangping wandered around the campus of Columbia University, when the cold wind hit, he lowered the brim of his hat, and he suddenly missed Miss Jennifer.

On cold nights, people need warmth that is palpable at hand to soothe lonely and rebellious souls.

Li Kangping wrote an invitation card: Dear Jennifer, I think we should watch a Chaplin movie together, and see you at three o'clock this Sunday afternoon, in front of Barnard College. K.P. Lee.

Li Kangping paced to the Barnard College women's dormitory and handed the invitation card to the dormitory manager, who asked her to transfer it to Jennifer.

The next day, Li Kangping received two letters, one from Jennifer and the other from the editorial office of Physical Review, from the dormitory manager of their Columbia College boys' dormitory.

"Dear Lee, thank you for the invitation, see you at three o'clock on Sunday afternoon. Jennifer. ”

Oh, lovely Jennifer, what an empathetic girl.

Physical Review is a business-like, impersonal face.

"Mr. K.P. Lee, I have received your paper and I attach my comments. Phys Rev。 ”

Phys Rev is a shorthand for Physical Review, and Li Kangping doesn't know which editor is following up on his paper.

"In terms of getting the concept of light atom gas, I think it is necessary to list the equations that are specific to the derivative...... Your interpretation of Venn's formula is not convincing enough, please come up with a stronger explanation......"

Academic opinion drafts are handwritten, unsigned, and it is not known which reviewer wrote them.

The reviewer was certainly not Professor Woodgate, because Professor Woodgate was a recommender of Li Kangping, and he would not be a reviewer of Li Kangping.

It won't be Professor Compton, because Li Kangping has already explained the paper to Professor Compton.

The days without WiFi and arXiv were really troublesome, and I have to explain it again.

Li Kangping wrote patiently and answered many questions from the reviewers one by one.

It's troublesome, but the good news is that it's better to have someone ask a question than nothing.

Now that the reviewers are asking so many professional academic questions, it is interesting to see what happens next.

To be exact, it took Li Kangping only six hours to write the paper, and it took him six hours to explain the paper to Professor Rosberg, Professor Compton, Professor Woodgate, and the reviewers.

On Sunday, Li Kangping went to the first floor of the Ferdinand Building and delivered his reply to the Physical Review mailbox.

The editorial office of Physical Review is located here, but Li Kangping must follow the rules, and until he gets the proof, he cannot directly contact the editor or anyone in the editorial office, and the only way to contact is by letter.

In the northeastern United States this season, most wildflowers wither and wither. Artificially cultivated greenhouse flowers bloom in New York florists, red, purple, orange, white, and purple and red are intertwined and fragrant, and if you don't know what to give to girls, send flowers.

Li Kangping picked and chosen, and finally chose Violet. The clerk wrapped the flower stems in tin foil, tied a bow with lace, and handed a bouquet of exquisite violets to Li Kangping.

At three o'clock, Li Kangping drove to the gate of Barnard College, and he stood by the car, waiting for Jennifer.

It's normal for girls to be ten minutes late, and Jennifer arrives belatedly.

"Hi, Jennifer." Li Kangping sent violets.

"Hey." Jennifer took the violet and played with the delicate petals with her beautiful fingers, and she said happily: "What a beautiful flower, I like it, thank you!" ”

The beautiful and bright flowers are dedicated to the people who look forward to the life, and the gentleman who behaves well takes on the responsibility of protecting the flowers as a matter of course.

Li Kangping opened the right front door: "Jennifer, please get in the car." ”

Jennifer was surprised and said, "You came by car?" ”

Li Kangping explained: "I calculated that the cost of taking a taxi 438 times in New York could buy a Ford, so I bought this Ford. ”

"This car is really good!" Jennifer complimented, and got in the car.