Yu An hung up the phone and looked out the window at the sky where the rain had stopped. After looking at the time, he walked downstairs, came to the door of Zhang Ning's room, and knocked on the door.

The door opened, and Zhang Ning raised his eyes to look at him, "Something?" ”

"Well, do you know where Professor Zhao's home is? Physicist Zhao Boye. ”

"Grandpa Zhao, I know, wait a minute." With that, she closed the door, she changed into a sports suit, and walked out.

"Let's go, I'll take you."

"Thank you, it was my mentor who told me to go to him. Can you wait for me? I want to go to the small supermarket to buy a basket of fruits. Yu An asked, Zhang Ning, who had his hands in his pockets.

Zhang Ning stopped, stood outside the courtyard gate and said, "Go ahead." ”

Yu An, who was carrying the fruit, was dumbfounded, it turned out to be in the same place, only 200 meters away from them. "I thought it was going to be far away, hahaha." Yu An looked at the gate of the courtyard and smiled.

Under the orange light, Zhang Ning stepped forward and rang the doorbell. After a while, the two old men walked out with each other's arms, and when they saw it clearly, a smile suddenly bloomed on their faces.

"It's Ning Ning, we just wanted to see you, we just came back from your Uncle Zhao's house for a while. Have you eaten? The old man with his hair coiled opened the door and took Zhang Ning's hand to speak.

"Eat, Grandpa Zhao, good evening Grandma Zhao!" Zhang Ning looked at them obediently and said. looked at Yu An, who took a step forward, looked at Zhao Boye and said, "Grandpa Zhao, this is Yu An, my friend." ”

"Professor Zhao, Mrs. Zhao is good." Yu An walked up and said to them.

Zhao Boye looked at Yu An, who had short hair, upright facial features, and a somewhat pale face. Nodding his head, he said, "Kid, come in." My classmates, your mentors, told me about you. ”

"Children, sit down and eat fruit."

"Sit down, you can sit too, wash the fruit and call me." Zhao Boye took the fruit bowl from his wife's hand and put it on the coffee table.

"Let's get started, I will, I'll answer them all for you." The old man sat down, his eyes shining and looking at Yu An.

Yu An nodded, "Thank you, teacher, then I'll start." ”

In the following question-and-answer conversation, the more they talked to each other, the more passionate they became, and their eyes flickered, as if they had seen the universe in their conversation.

Listening to their conversation, Zhang Ning refreshed his cognition of physics in the textbook, as if opening many doors to see the meaning of their existence and the infinite possibilities waiting to be explored.

"In the face of the unknown, we must be humble and learn. A person's life is very short, and if he can do a little light, it is also light. Never give up, the sea of stars is a journey, you will pass by the bright galaxy, and you will also pass through the darkness. Ning Ning, you understand, whether you are a genius or not, don't be complacent. Genius is rare, and if you don't work hard, you can become stupid. The old man's gaze stayed on the two of them for a while, and then stayed on Zhang Ning for a long time, and said slowly.

Zhang Ning lowered his head with a face full of shame and nodded, "I know." ”

"Leave him alone, he likes to teach. Come with me, I'll talk to you. The old man held Zhang Ning's hand, glanced at his husband with disgust and said.

Zhao Boye pouted helplessly, looking very aggrieved. Then he looked at Yu An, then looked at them and said, "Yu An, you go to the study with me, I have something to show you." Don't go out, the yard is damp. ”