Wan Lei rewoven the wicks, remelted paraffin, and recast candles. Soon, Wan Lei produced the first batch of no-cut candles. He hurriedly lit them and found that, as he expected, the candle wicks naturally loosened after burning out.
Open, the end just tilts up to the outer flame and burns completely, thus eliminating the need for cutting.
Big inventions come from small inspirations! Wan Lei shook his slightly heavy head and smiled with satisfaction. He knew that once this kind of no-cut candle was released, he would be able to sell it at a better price, and he would be able to make a fortune soon.
At this time, the bright moon was already setting in the west, and Wei'er was lying down beside the experimental table and fell asleep, with the corners of her mouth turned up, and her two willow eyebrows jumping up and down, as if she was having a sweet dream. Wan Lei couldn't bear to disturb her.
, I just got a blanket to cover her body, but later I felt dissatisfied, so I got a pillow for her to rest on.
The spring rain that lasted for several days stopped, and insects were chirping outside. Wan Lei had no intention of sleeping and wanted to go out for a breath of fresh air. However, when he just stepped out of the door, he saw that the lights in Laboratory No. 2 were still on.
He walked over slowly and saw that Miaozhi was still staying up late reading a book under the oil lamp, taking notes while reading. This diligence was comparable to those preparing for the college entrance examination.
However, in Wan Lei's life dictionary, healthy living, happy learning is the king, and abnormal bad habits that destroy the body and mind, such as forgetting to sleep and eating, hanging from the penis and stabbing the buttocks, are not allowed, especially at an age like Miaoyi who is making progress every day, let alone overdrawing his life. Therefore,
He gently pushed the door open and entered the room, and knocked on the table a few times. Only then did Miao Yi notice his arrival.
"Sir, haven't you slept yet?" Miao Yi quickly stood up.
"Go to bed." Wan Lei put away the book and her notes without saying anything more to her.
"There are still many questions that I haven't figured out yet, so I can't sleep." Miao Yi looked at Wan Lei eagerly, as if begging him to be merciful and put down the book.
"Is there anything you don't understand? Ask now, and then go back to bed after asking." Wan Lei softened his heart again when the other party looked pitiful.
"It is said that the sky is round and the earth is round. Why does your teacher's book "Physics" say that the earth is spherical?"
"This question is difficult to explain. Let me introduce it slowly." Wan Lei had expected such a situation. After all, the theory of a round sky and a square earth had been deeply rooted in the hearts of the ancients. It was not easy to change their minds.
He first calmed down, cleared his thoughts, and decided to use the divergent thinking teaching method to inspire Miaozhi's imagination, so he asked: "Have you been to the beach?"
"I grew up by the sea, but what does this have to do with the earth being spherical?"
"It has a lot to do with it. First, think about it carefully. What is the process of docking a ship on a long voyage?"
"What else could it be like, from far to near, getting bigger bit by bit." Miao Yi recalled.
"You haven't observed carefully enough. When the big ships docked, they seemed to float up from the sea, first revealing the tall ship's pole, and then slowly revealing the hull. If you don't believe it, you can take a closer look later.
.”
"The further away the ship is, the smaller what we can see with the naked eye. The waves on the sea are large and cover the ship." Miao Yi frowned, thought for a while and then explained matter-of-factly.
"What you said is not correct. Let me demonstrate it to you." Wan Lei took a small wooden block as a model of the ship, placed it on the back of a spherical container, and then slowly moved it along it.
"How is it? Is it the same as what I said, that the ship emerged from the sea?" Wan Lei asked after demonstrating it several times.
"But, but, this does not mean that the earth is a ball. If the earth is really a ball, let alone people, the sand, the sea, etc., will all fall into the sky, and they will not form a ball at all."
Miao Yi frowned, still looking unbelieving.
"One example can't explain it, so let me give you another one. Tell me why there is an alternation between day and night."
"This is not simple, because the sun, moon and stars all revolve around the earth." Miao Yi replied not taking it for granted.
Wan Lei shook his head and said: "The example I gave is mainly to prove that the land we are on is not square, but a big ball. This ball is very big, with a diameter of more than 20,000 miles. Since our number has been
The field of view is limited, so we think it is flat. If someone stands very high, higher than the sky, then he can see the whole picture of the earth, and he will find that the earth is reduced to a circle.
A big round watermelon.”
"But, if the earth is really a ball, wouldn't those things opposite us fall into the sky?" Miao Yi asked still puzzled.
"This is because of universal gravitation. Now, I just want to explain the fact that the earth is a sphere. Only when you recognize this fact can you use a lot of imagination to explain it reasonably. If you don't believe it, you can use many methods to verify it."
"But even if the earth is spherical, why does it revolve around the sun and not the sun around the earth?"
"Well, it's also because of the force of gravity. The volume and mass of the sun are countless times greater than that of the earth. The earth cannot pull the sun. The moon is only one-eightyth of the earth, so the moon revolves around the earth."
"Gravity? What kind of force is this that can pull the earth and the moon?"
"In fact, everything has a mutual attraction, which is proportional to the mass and the bisector of the distance. That is to say, the greater the mass, the greater the gravity, and the farther the distance, the smaller the gravity. Gravity is formed by the celestial system.
The reason is, if there was no gravity, there would be no sun rising and moon setting, in fact, there would be no life."
"If there is gravity, why aren't the Earth and the Sun pulled together?"
"Have you ever flown a kite?" Miaoyi nodded, and Wan Lei added: "The kite must be pulled by a string, so that it will not fall to the ground even if it does not fly high. The earth is like a kite, the sun is like the ground, and the string is gravity. In gravity
Under the action of , the earth keeps rotating around the sun, and the rotation period is one year, and the earth itself also rotates, and the rotation period is one day."
"But if the earth revolves around the sun, why does winter and summer alternate?"
"We'll talk about this later in geography class. Now you go back to bed right away." The other person asked him a hundred thousand whys. At this time, Wan Lei seemed to be explaining the theory of relativity to kindergarten children. He couldn't say anything.
clear.
Miaoyi saw that Mr. Wan was a little impatient, so he had to leave with a hundred thousand something. After this night conversation, Wan Lei found that he was really not a teacher, so it was best to find a "substitute teacher"
”, let him be responsible for preaching and teaching.
But the key question is, who can be the substitute teacher?