The next day, Professor Potter broke his promise, and instead of taking Junxin to Mr. Gu Yuxiu's home in person, he sent his graduate student to take Junxin there.

The place where Gu Lao is located is very secluded, which has a lot to do with his belief in Buddhism and his specialization in Buddhism. Philadelphia is the fourth-largest metropolis in the United States and the third-largest city in the eastern United States. The land price here is every inch of land, and it is no worse than the land price in Beijing, Shanghai and Guangzhou in China in the 21st century. So it's not easy to find such a secluded place in such a big city, which speaks volumes about Penn's status in Philadelphia.

"Tuk Tuk!" Coming to the front of Gu Lao's courtyard, Jun Xin stood in place and was silent for a while before raising his hand and knocking on Gu Lao's door.

"Who?" The one who opened the door was a middle-aged lady, about thirty or forty years old, and her eyebrows were somewhat similar to the old Gu that Junxin was familiar with. Junxin instantly understood the identity of the person who came, it should be Gu Lao's daughter, Ms. Gu Weimin who lives in Oklahoma City.

"Hello, I am a student from Shuimu University in China, I came to visit Gu Lao today, I was in a hurry in advance, I didn't have time to say hello, I don't know if Gu Lao is at home?"

Gu Lao's daughter was obviously stunned, and her eyes were full of surprise when she looked at Jun Xin. Junxin didn't remind him, so he let him look at it, his face was not shocked.

"Dad, there's a student from BJ looking for you!" After a long time, Ms. Gu realized the faux pas, smiled apologetically at Jun Xin, let Jun Xin into the courtyard, and shouted loudly into the house.

"I'm sorry, my father should be trimming the flowers and plants at the back window right now, you should go in and wait for him!"

"Thank you!" Junxin smiled slightly, and walked into the living room.

Gu Lao's living room is very simple, except for a coffee table, there are only a few armchairs left, and there are some snacks and a set of tea sets on the coffee table, and there is nothing else.

Ms. Gu brought a glass of water, sat next to Junxin and said apologetically, "I'm really sorry, I'm going to make you wait for a while." Are you a student at Mizuki University and haven't asked for advice yet? ”

"It's rude!" Junxin smiled apologetically, "My name is Junxin, I am a student in the Department of Mathematics at Mizuki University, and I am now an exchange student in the Department of Mathematics at Princeton University, and I am now a sophomore. ”

"Junxin? Are you Junxin? Ms. Gu asked in surprise.

"If there is no one else here, then Junxin is indeed me!" Junxin's expression towards Ms. Gu was not very surprised, or that he was completely immune to others looking at him with strange eyes.

"My father often mentions you to me, he is very concerned about you, not long ago when Professor Chen came to see him, he also mentioned you to him, I didn't expect to see a real person today." Ms. Gu said with a sigh of emotion.

"Princeton is not far from Philadelphia and it's easily accessible. It stands to reason that I should have come over to visit Gu Lao as soon as possible. I had no choice but to be entangled in miscellaneous things for a while ago, and it was really a sin to finally have such a short period of time to visit Gu Lao. Junxin lowered his posture and shook his head and said.

"Okay, I'll urge my father, if he knows you're here, he'll be very happy!" After saying that, he got up and walked to the back.

After a while, Junxin saw an old man in his eighties appear at the door. Junxin immediately stood up from the armchair and greeted respectfully: "Hello Gu Lao, Junxin came to visit Gu Lao at the end of the school, because of the hurry in advance, I didn't have time to inform him, please forgive me." ”

"Haha, as the province said, a talent. Sit down, I don't have any rules. Gu Lao didn't speak when he came to Junxin Junxin, but looked Junxin up and down carefully before he said happily.

"Old Chen has been here recently?" Jun Xin asked in surprise, as far as he knew, Chen Lao should have returned to the enlargement.

"It was after a meeting that passed by me. He was on a plane from Philadelphia to California! Gu Lao explained with a smile.

"I see!" Princeton is halfway between the two big cities of Philadelphia and New York, and it's about the same distance to both cities.

"That's Chen Lao's praise, and I can see the past with this appearance."

"Hehe, it's hard to say. The so-called belly has poetry and books! Appearance doesn't matter. Gu Lao said gently.

"It's been so long since you've been in the U.S. that you want to come and see me?" After a pause, Gu Lao said complainingly.

"I'm an exchange student at Mizuki University, and I'm very busy with my tasks, and I've had a lot of things going on late, so I'm late, and I ask Gu Lao to forgive me!" The so-called eighty-year-old child, Gu Lao is also eighty years old, and he speaks with a little child's temper.

After the two chatted for a while, the two of them, as scientists, naturally led the topic to academic topics.

"Xiaojun, I recently saw some of your articles in the Physical Review Letters, although I am a major in electrical engineering, but I also know a little about physics. You seem to have been working on Mr. Einstein's unified field problem lately? Gu Lao asked.

Junxin was also planning to use Gu Lao's influence in Penn to spread the influence of superstring theory, so after hearing Gu Lao's words, he did not hesitate to tell all of his recent research.

Gu Lao listened very carefully, as he said, Gu Lao does have a high attainment in physics, at least in Einstein's theory of relativity. So from time to time, I interrupted Junxin's narration and asked my own questions.

"It turns out that you cut into quantum mechanics and relativity by studying Xiao Yang's theory, but you borrowed supersymmetric string theory as the core of the theory, which is a very subtle idea." Speaking of this, Gu Lao sighed and said, "The theory is very good, although it can't prove right or wrong. But I don't think I will see the day when this theory will be proven, and this theory is not my major, but Xiao Yang, Xiao Li and Xiao Ding should like your theory more, and you can talk to them when you have time! ”

Jun Xin suddenly felt a burst of waterfall sweat, Xiao Yang, Xiao Li, and Xiao Ding, the three people Jun Xin naturally knew that they were referring to Yang Zhenning, Li Zhendao and Ding Zhaozhong. They are all the top Chinese scientists in the study of microscopic example physics and high-energy particle physics, and the theories studied by the three of them are of great significance to the world scientific community. And all three of them are Nobel Prize winners in physics, and they belong to the level of big names in the scientific community. Only people like Gu Lao, who are old, have high achievements, and are elders, can call them that.