Not far away, there was a low-key black Buick parked on the side of the road, a middle-aged uncle was over half a hundred years old, but there was not too much silver thread on his head, and he was meticulous in a suit.

"It's Uncle Fang, come to pick us up and go to Shen Cheng's house."

Shen Yu beside him nodded to Uncle Fang and explained to Song Yiran in a low voice.

Uncle Fang's car drove very steadily, he sat in the driver's seat, holding the steering wheel, his eyes were fixed on the front, and he did not squint.

The road is smooth, but it does not lose speed.

"Uncle Fang, can Shen Tingyuan come back on time?"

There was soothing music playing in the car, Shen Yu opened his lips to chat, Song Yiran was originally concentrating on looking at the roadside scenery outside the window, and when he heard the sound, he turned his head and watched silently.

"Before Mr. left, he said that he would try to deal with business as soon as possible, but Madame didn't go out, after all, it was the birthday of the little master, and she was decorating the room wholeheartedly."

Shen Tingyuan is Shen Cheng's father and Shen Yu's elder brother, less than thirty, but has established his own company and family.

Although he is a little older and depressed, he has no elders at all, the two are more than ten years apart, and they get along very comfortably like friends, and he is a cultured and approachable brother.

"Uncle Fang, can you stop by the surrounding gift shop for a while?"

Song Yiran had a smile on her polite face, she wanted to buy it on the way with Shen Yu, but now she can only stop and buy it, she doesn't know what the little boy will like, and she wants to take Shen Yu to choose a satisfactory gift together.

"Okay, Miss Song."

Uncle Fang's gentle voice came from the front, and then he turned the steering wheel and stopped the car not long after.

"I'll be waiting for you where I am."

Uncle Fang's gaze came from the rearview mirror in the car, and he turned his head to look at Song Yiran and Shen Yu.

Uncle Fang is very good at finding a place, and the car is parked at the corner of the gift street, where the gifts are varied, which is very suitable for people like Song Yiran who choose phobias to choose gifts.

"What kind of gift would little orange like...... What gifts did you like when you were younger? Let me guess, cars? Robot? ”

The gift street is decorated like a fairy tale town, the buildings are brightly colored, walking in the middle of the pebble road, Song Yiran muttered to himself, raised his head again, and looked at Shen Yufa with his eyes full of stars and asked.

"I love building blocks."

Looking at the completely relaxed appearance of the girl in front of her, Shen Yu lowered her eyes and hooked the corners of her lips, and slowly opened her lips with a gentle expression.

"Why do you like building blocks?"

"When I was a child, I didn't have any other toys, and when Bai Ze didn't come to me, only the building blocks accompanied me."

Looking at Shen Yu's somewhat lonely face, Song Yiran couldn't help but think of what Bai Ze had said before, and a picture flashed in his mind, in the center of the big room, a boy sat on the ground with his head down in the light and shadow, with a messy building block in front of him, and the room was so quiet that it seemed that the footsteps of time could be heard.

It's so lonely.

"That home is beautifully decorated! Let's go to that house. ”

Song Yiran shook her head, trying to drive away the pity that rose in her heart, she didn't want the atmosphere to become heavy, with her... Accompanied by them, Song Yiran believes that he will not be lonely again in the days to come.

When the two walked into the house, they found that compared to the decoration outside the store, the inside of the store was really unique.

The storefront of Nuoda is divided into three areas, men's and women's areas, and daily areas.

The decoration style of each area is very different, and each area is also divided by age, and the level of gifts rises in a straight line, such as the men's area from the beginning of the robot, car, to the back will become a belt, wallet, and so on.

It's like a small gift encyclopedia.

"Hello, do you need a recommendation?"

A well-built man walked past the front desk, still holding a game console in his hand, with a casual expression, looking like the owner of the storefront.

"Hello, trouble, I want to buy a gift for the little boy."

"What kind of personality is a little boy, if you are more lively and active, you can try the voice robot in front, or a remote control airplane car."

Song Yiran thought about it for a while, Shen Cheng was probably not that kind of child, quietly soft and cute, until Shen Yu was by his side, he didn't talk more.

She turned her gaze for help to Shen Yu.

"He's usually quieter."

Shen Yu, who received the signal, paused and spoke.

The shopkeeper calmly took the two of them to the right and walked a few steps to the right, "Quiet children, you can try building blocks, puzzles, or this kind of figure-made dolls." ”

"Okay, thanks."

Shen Yu nodded to the shopkeeper as a sign of politeness, his eyes glued to the gift shelf.

"No thanks, you can watch first, and then call me if necessary." The shopkeeper leaned over in amusement, returned to the front desk seat and played the game.

There were a lot of gifts for the little boys on the shelves, and Song Yiran looked at them one by one, a little dazzled.

"Look at this, it's fun!"

On the shelf in front of Song Yiran, there was a strange little toy, and several rows of small balls stuck together were hanging from the bar, as if they were magnetic.

With her hand, the leftmost ball bounces outward, returns to its original position, and then the other ball bounces off, and the cycle repeats.

"It's a Newtonian pendulum."

Shen Yu raised his eyes, looked at Song Yiran with a face full of novelty and smiled, reached out and touched her little brain.

"Ask for popular science."

Hearing this, Song Yiran turned her head excitedly to look at Shen Yu, her crystal eyes full of curiosity.

Shen Yu smiled, and slowly opened his lips to do popular science.

"When two metal balls collide, an elastic collision occurs."

"Before and after the collision, the kinetic energy is constant. Ideally, i.e., the ball is only subjected to momentum, energy, and gravity, and all collisions are perfectly elastic and structurally perfect, so that the metal ball will move forever. ”

Looking at the small balls in front of him that were about to lose their swinging regularity and all of them were swinging together, Shen Yu stretched out his hand to hold it steady, re-adjusted, and continued to speak.

"But there can be no perfect Newtonian pendulum, because it will always be affected by friction and cause energy to be lost."

"Part of the friction comes from air resistance, while the main thing comes from the ball itself. So the collision in the Newtonian pendulum is not a true elastic collision but an inelastic collision because the kinetic energy after the collision is lost compared to before the collision. ”

"To put it simply, friction determines its imperfection."

Song Yiran heard it in a fog, the reason why she chose the liberal arts class was because of the unsatisfactory grades in physics and chemistry.

I remembered that when I first met him in the Academic Affairs Office, I seemed to have heard the teacher who persuaded him to go to the science class say that Shen Yu was an all-rounder in arts and sciences.

"Do you like physics?"

The sudden question made Shen Yu raise his eyebrows in surprise, and smiled dumbly, she really didn't listen carefully to what she said about Newton's pendulum principle, I really don't know what is in the little brain, he smiled and shook his head.

"I don't have much interest in physics, I like biology more."

Song Yiran nodded as if she didn't understand, "Then do you want to major in biology in the future?" ”

"Well, what about you?"

"Me, I don't have any goals, I want to study languages or archaeology."

Song Yiran didn't have any special ideals since he was a child.

My father first taught in the chemistry department of the university, and later in order to earn more money to support her, he opened a studio and took on some corporate chemical research projects.

The salary is indeed better than before, but she spends less time in the studio every day and goes home, and she doesn't want her father to be so busy but also weak.

So Song Yiran has no good impression of physical chemistry spontaneity, and only hopes that her children will not grow up without companionship in the future.