The propaganda effect of the lecture in Lingji Palace was immediate.

The next day, thirty or forty people came to visit Chunsong Hutong, wanting to learn more about science with Zhao Hao.

After all, yesterday Zhao Hao only talked about the role of science, but only made a general talk about its content. It's like when later generations watch the trailer and want to see the feature film, is there a level that the film shows?

However, when they inquired all the way to the west gate of Zhaofu, they saw a huge wooden sign hanging on the doorpost of Guangliang Gate.

There is a large line of bold writing on it: 'Those who do not understand geometry should not enter this door'.

"If you don't know geometry, don't enter this door?" The Confucian scholars looked at each other and asked each other, "What is the geometry?" ”

Someone suddenly said: "Yesterday at the gate of Lingji Palace, I received a booklet, one of which seems to be called "A Glimpse of Geometry". ”

"Not bad." Wang Wuyang appeared in the doorway in response, bowed his hand to everyone, and then explained loudly:

"Geometry is an introductory subject, but not everyone is suitable to be a scientist. In order to avoid wasting the time of my master and everyone, I specially distributed a number of "A Glimpse of Geometry" yesterday, and only those who can understand this book can become the disciples of our master and be taught the true meaning of science. ”

"That's not what Zhao Gongzi said yesterday," someone objected: "He said that if you are interested, you can come to Chunsong Hutong and show us the scientific truth." ”

"Oh, that's a science demonstration." Wang Wuyang pointed to the east gate and said, "You enter through that gate, and every day we and other brothers will take turns to demonstrate scientific experiments for the guests. ”

"That's ......" the guests said in their hearts, don't look at this small school of science, it's quite formal.

So they walked to the east gate of Zhao's mansion, where there was another plaque hanging on the doorpost.

In addition to the 'popular science demonstration', in addition to the four big characters, there are also daily opening hours - one in the morning and one in the afternoon, each for half an hour.

Zhao Hao added five disciples to Zhao Shizhen, and the six of them were divided into three classes, each of whom came to pick up customers for half an hour in three days, which did not affect learning, but also promoted science, and did not need to pay wages.

~~

The guards at the door invited the guests into the west wing, which had been set up overnight, and there was a stove with coal root burning and tea and snacks.

As soon as the hour arrived, Wang Dingjue, who picked up the guests today, came out, and then in the curious eyes of the guests, he began the first lesson of popular science - 'Open your eyes to see the world'!

Yes, it is the lesson that Zhao Hao taught to Eryang in Yuhuatai.

However, the content of the courseware has been adjusted, first of all, the ring of watching the moon at night has been deleted, and the globe has not been displayed - this is a decision made by Zhao Hao this morning.

This is Beijing City, not the capital city far away from Emperor Tiangao, and Xu Ge Lao is still staring at it, it is too subversive, and something big is going to happen.

Well, the initial stage is still obscene development, don't wave.

However, Zhao Hao added several interesting scientific experiments, such as 'lighting a lamp in the water', 'water flowing to a high place', 'rainbow in the water', 'fishing copper coins in an oil pot', 'kaleidoscope', 'eggs floating on water' and so on......

These little experiments are fun and engaging, and the experimental props are readily available.

Usually when he has nothing to do, Zhao Hao will come out and explain it to his apprentices, so that they can have an intuitive understanding of scientific concepts.

At this time, Wang Dingjue can take the medicine according to the prescription......

The guests saw him put his hand into the boiling oil pot, and they couldn't help but gasp, and some even covered their eyes unbearably.

Wang Dingjue casually twisted out a few copper coins, wiped his hands clean, and explained to the guests that this was because half of the vinegar was added to the oil pot. The boiling point of vinegar is much lower than that of oil, so when the temperature is not high, it will boil the pan, creating the illusion of boiling oil.

Through this experiment, the guests memorized what the 'boiling point' is, and different liquids have different 'boiling points'.

Wang Xijue threw another raw egg into the bowl, and the egg slowly sank to the bottom. Then he added two spoonfuls of salt to it, and in a few moments the egg floated again.

Through this experiment, the guests learned what 'density' is, and the higher the density, the greater the buoyancy.

They also saw heavy tin boxes floating in a basin of water – even more shocking than 'boiling oil for copper coins'!

That's made of iron!

This time, a young man dressed as a prisoner rushed to answer: "Because the iron box is hollow, is it less dense than water?" ”

Wang Xijue glanced at the young man with a little surprise, remembered his appearance, and then nodded with a smile: "Density is equal to mass removal volume." Mass can be understood as weight, while volume is only related to size, and it doesn't matter if it is solid and hollow. So the smaller the mass and the larger the volume, the greater the buoyancy......"

"Doesn't that mean that iron can build ships?"

"Of course you can, as long as you make an iron boat with a density less than water under the guidance of this formula, you can naturally float on water." Wang Dingjue smiled faintly and affirmed: "This is the role of science. ”

"Awesome! Terrible! ”

Seeing the magic of science and learning about the scientific calculation method, the guests gradually listened to it, and all looked at Wang Xijue intently, listening to him continue to carry out vivid and interesting science popularization.

Zhao Hao stood at the back door, through the curtain, looking at the attentive scholars inside, revealing the relief of an old mother.

~~

Happy learning time is always so short.

Unconsciously, an hour passed, Wang Dingjue put down the prism in his hand, and smiled politely at everyone: "This is the end of the morning's popular science, please leave the same way in an orderly manner." ”

"Can you still watch it in the afternoon?" The guests asked intently.

"You can go to the concierge to sign up, and there are up to thirty people in a class." Wang Dingjue said, and reminded everyone: "However, in a short period of time, the experimental project will not change." So if you have seen it once, please try not to come again, and leave the opportunity to more people. ”

After a pause, Wang Dingjue tempted everyone again: "These are actually just small experiments in physics, and physics is only one of the disciplines in this discipline." ”

Of course, he won't tell them, in fact, he has only studied it himself, and Wang Wuyang's hand-copied "Elementary Physics" is not understood in many places......

However, Master said that the most important thing to be a teacher is to be a dog in a panic, but on the surface he is as stable as an old dog, so that he can calm the field.

The guests then went out of the door. Having seen so many amazing experiments and knowing why, who doesn't want to know more about physics?

"Looks like I'm going to have to go back and flip through the Geometry book." Someone rubbed his hands and said, "Come back after you understand." ”

"Yes, this science is not ordinary. Not only can you do experiments, but you can also summarize the truth and what...... Formula, I think it's very useful. ”

"Let's go back and watch Geometry."

The guests returned to the street, looked at the wooden sign that said "If you don't know geometry, don't say anything", and the itching dissipated.

Wang Wuyang stood at the door, looking at the crowd that kept turning back, and smiled at the second junior brother on the side: "People are like this, if they are too easy to get, they will not cherish it." ”

"That's why Senior Brother cherishes it very much." Hua Shuyang smiled sheepishly. He has always been proud that his apprenticeship is easier than Wang Wuyang, and he often makes fun of his senior brother with this.

Wang Wuyang was really furious, and was about to chase away, but he heard a question with a Qin accent behind him:

"May I ask you two, how can you understand geometry?"

ps. The third more is delivered, ask for a monthly pass, and recommend a ticket ~~~