"By the way, Pang, it's Christmas. I'm going back to the United States, and by the way, do the submission. Would you like to go to Princeton with me?"

Edward Whitten thought about it again.

Edward Witten and Tsinghua signed a two-year contract. He originally thought that it would take at least one to two years to get the m-theory, but he didn't expect that this year was not over yet. .

But now that he has come to Tsinghua, Edward Witten did not intend to terminate the contract with Tsinghua in advance.

In this half year, Tsinghua gave him a high degree of freedom, and his cooperation with Pang Xuelin was very comfortable.

From time to time, the two exchanged opinions on the latest physics and mathematical progress, and they felt that they had benefited greatly from each other.

And under the leadership of Edward Witten, many cooperation agreements have been reached between Princeton and Tsinghua University.

It even directly led to a joint graduate training program in the Department of Mathematics and the Department of Physics.

At the same time, Princeton University has also put forward a proposal, hoping that Pang Xuelin can serve as an adjunct professor at Princeton University and only needs to spend three months in the past.

In this regard, Pang Xuelin did not have much opinion.

After all, whether it is the patent issue of sildenafil and atorvastatin, or whether he wants to make a difference in the Internet field in the future, the United States is a country that cannot be bypassed.

Spending a few months in the United States each year helps Pang Xuelin to have a clearer understanding of the development of the Internet and the latest economic hotspots in the world.

Pang Xuelin said: "Okay, anyway, I would go to Princeton for two months every year, this time I will go to the United States with you this Christmas."

Witten laughed: "Well then, come to my house for Christmas, I think Jennifer will certainly welcome you very much."

Jennifer is Witten's wife. She and Witten have a son and a daughter, both of whom are adults.

The eldest son has just graduated from college and is a programmer who is said to have worked for Microsoft.

The youngest daughter has just been admitted to the University of Southern California's School of Motion Picture Arts.

After Witten came to China, Jennifer came and stayed for half a year. Pang Xuelin got along well with the Witten couple.

However, this time when he went to the United States, A Qing couldn't go.

In the first half of this year, after A Qing transferred to the primary school affiliated to Tsinghua University, she passed the school test because her foundation was so poor that she could only enter fourth grade.

Fortunately, this girl is also furious, plus Pang Xuelin urged tutoring. For half a year, A Qing's performance has reached the top five from the bottom of the class.

Not surprisingly, there is no problem entering Tsinghua Affiliated Middle School after graduating from primary school.

"A Qing, this time your brother is going to the United States, you have to listen to Sister Liu, OK, up to three months, my brother will come back from the United States!"

Pang Xuelin touched A Qing's head and said.

"Ok!"

Although A Qing's eyes flickered with reluctance, he nodded subtly.

Pang Xuelin smiled and looked up to Liu Jiahuan and said, "Jia Huan, during this time, please take care of A Qing."

Liu Jiahuan looked at Pang Xuelin and laughed: "Professor Pang, rest assured, if you are with me, you can go to America with peace of mind."

Since the interview earlier this year, Pang Xuelin has maintained a good relationship with Liu Jiahuan.

Liu Jiahuan likes A Qing very much. From time to time on weekends to see A Qing and take her out to play.

Therefore, after going to the United States this time, Pang Xuelin considered for a long time, but decided to speak to Liu Jiahuan and give A Qing her care.

Liu Jiahuan agreed in one fell swoop.

She lives in the suburbs of the capital. She works at CCTV and rents a small apartment. She usually feels deserted when she lives alone.

Now with A Qing's company, she feels very happy.

On December 15, 1993, Pang Xuelin and Edward Witten officially boarded a flight to New York.

After a long flight of thirteen hours, the two arrived at Newark International Airport. As soon as they exited the passenger exit, they saw a young man in his twenties who was holding a sign with the names of the two and stood Waiting at the passenger exit.

"Hey, Eddie, it's been a long time!"

Edward Witten went up and hugged each other, then turned around and introduced: "Pang, let me introduce you, this Morse Eddie, Deligne's assistant!"

"Hello Professor Pang, nice to meet you!"

Eddie shook hands enthusiastically with Pang Xuelin.

"Eddie, I'm glad to meet you too!"

The three greeted a few words, and Pang Xuelin and Witten followed Eddie to the parking lot and boarded a Chevrolet off-road vehicle.

Two hours later, the car drove into the small town of Princeton. The residence arranged for him by Princeton University was just opposite the Witten's house, a single-family cottage with only two floors. There were two bedrooms upstairs. The living room, study, kitchen, dining room, and a fireplace. The rent of one thousand dollars a month was paid for Pang Xuelin by Princeton University.

After Pang Xuelin settled his luggage, Witten came over and knocked, saying that Jennifer had prepared dinner for their arrival.

That night, Pang Xuelin ate at Witten's house, a typical American meal, mashed potatoes, fried steak, golden qiāng fish salad, and a roast turkey.

The next morning, Pang Xuelin and Witten went to Deligne's office, and then went through the formalities of adjunct professor at Princeton University.

Although it is a part-time job, he only needs to teach an undergraduate course in Princeton every year and stay in Princeton for more than three months, but Pang Xuelin can still receive a salary of 5,000 US dollars per month, which is 20 times his domestic salary.

It is said that big men like Deligne and Wiles have annual salary of more than 300,000 US dollars.

After completing the entry procedures ~ lightnovelpub.net ~ Because there is still a week before the Christmas holiday, Pang Xuelin has nothing to do in a moment.

So on the third day when he came to the United States, Pang Xuelin went to the second-hand car market and spent $ 12,000 to buy a five-year new second-hand Ford tempo as a tool for travel in the United States.

He obtained his domestic driver's license as early as August this year, and applied for a translation of an international driver's license before coming to the United States. In addition, he was accustomed to American traffic rules in his previous life, so he did not worry about driving.

On the morning of December 19, Pang Xuelin got up and drove out.

This time, his destination was Cambridge, located in Boston, Massachusetts, northeast New York.

It took almost five hours for Pang Xuelin to finally arrive at Harvard University.

The car was parked in a parking lot on the campus of Harvard University. Pang Xuelin got out of the car and strolled on the campus.

He did not tell Wang Muhui in advance that he had come to the United States, and this time he came to her as a surprise. 13