"Leilee, let me do it!" The little girl Meng Chencheng was anxious for her nephew and reached out to help her nephew jump into a paper frog.

Meng Chenyi grabbed his sister: "Let him do it by himself. You were the same when you were a child, and you need to learn by yourself."

After being stopped by the second brother, Meng Chencheng could only shake his head to his nephew and said that he could not help: "Leilee, you should work hard on your own."

Leilei tried hard when he heard his aunt's words, and his little finger pressed the tail of the paper frog more vigorously, and the paper frog remained motionless.

Grandpa Meng, who was standing beside him, couldn't help laughing: The little great-grandson is so cute. Grandma Meng quickly grabbed her old man and said, "What are you doing when you laugh at the child?"

"No, no." Grandpa Meng immediately covered his laughing mouth.

Leilei's little face bulged, and he turned around and walked down the stool and ran to ask his mother for help.

Ning Yunxi, who was pulled over by his son, asked all the children present a question: "Do you know why frogs can jump?"

"It has legs!" The little girl Meng Chencheng was the first to raise her little hand to answer.

"But why can it jump higher than its body? Why? You also have two legs. Can you jump higher than your body?"

After being asked by Teacher Ning like this, Meng Chencheng thought for a while: "It seems that I can't? Can anyone?"

"Of course there is, athlete." Grandpa Meng couldn't help but interrupt.

"But why can't I be an athlete?" Meng Chencheng asked Grandpa Meng.

Grandpa Meng couldn't answer, so he could only ask his grandson's wife for help.

Ning Yunxi invited two college students to answer: "Come on, you two will give lectures to your sister and brother."

It felt that Teacher Ning had asked the two of them. Meng Chenyi and Lin Shangxian smiled awkwardly.

"Come here to speak. You will be a professor in the future and teach students. You cannot only have knowledge but no eloquence." Ning Yunxi greeted the two of them and said.

Meng Chenyi and Lin Shangxian listened to her words and naturally knew that Teacher Ning agreed for their own good. But how could they talk about popular science to kindergarten children and elementary school students? Meng Chenyi felt that it was difficult and had no clue. When his pen drew a frog on a white paper, Lin Shangxian helped him add: "Let's talk about mechanics first. The ability of athletes and frogs to jump high and far is related to the physiological mechanics of organisms. Among them, the leverage of the musculoskeletal system is the basis."

I am a doctor, have dissected frogs, studied orthopedics, and know the role of bones and muscles. I immediately used the principles of physics and mechanics.

"Archimid's leverage." Meng Chenyi sorted out his ideas and started from the simplest principle of leverage according to Lin Shangxian's suggestion. This is easier for children to understand.

The pencil was placed on a piece of plasticine, pressing one end with a plasticine, and pressing the pencil on the other end, and the plasticine on the other end jumped up.

The two brothers demonstrated physics experiments to the children on the spot. The simple experiment was enough to make kindergarten children and primary school students exclaimed surprise.

"I'll do another experiment for you." Meng Chenyi then pressed the book on the other end of the pencil instead, and jumped up like plasticine on the other end.

So amazing! The little girl and Leilei kept exclaiming.

The voices of the two children attracted Meng Chenjun and Meng Chenxi in the room. One of them had just studied physics, while the other was in high school and was in the physics stage. They were immersed in physics exercises every day, but rarely saw physics in reality. So they squatted on the side of the coffee table with the two children and watched their brothers' movements.
Chapter completed!