The publicity effect of the lectures at Lingji Palace was indeed immediate.

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

After all, Zhao Hao just talked about the role of science yesterday, but only talked about its content in general. It's like people in the future watching the trailer and want to see the feature film, is it as good as the trailer?

However, when they found their way to the west gate of the Zhao Mansion, they saw a huge wooden sign hanging on the doorpost of the Guangliang Gate.

Written in bold letters on it are "Those who do not understand geometry should not enter this door."

"Those who do not understand geometry should not enter this door." The scholars looked at each other and asked each other, "What is geometry?"

Someone suddenly realized, "One of the booklets I received at the entrance of Lingji Palace yesterday seemed to be called "A Brief Introduction to Geometry."

"That's right." Wang Wuyang appeared in the doorway, bowed to everyone, and then explained loudly:

"Geometry is the entry-level subject of our school, but not everyone is suitable to be a scientist. In order to avoid wasting my teacher and everyone's time, I specially distributed a few copies of "Geometry for Beginners" yesterday. Only those who can understand this book can become my teacher's disciples and be taught the true meaning of science."

"That's not what Mr. Zhao said yesterday," someone objected, "He said that those who are interested can come to Chunsong Hutong and demonstrate the scientific principles to us on the spot."

"Oh, that's a science demonstration." Wang Wuyang pointed to the east gate and said, "Everyone go in through that door. Every day, my brothers and I will take turns to demonstrate scientific experiments to the guests."

"Is that so..." The guests thought that although this is a small scientific school, it is actually quite formal.

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

In addition to the four big words "Popular Science Demonstration", there are also daily opening hours - one session in the morning and one in the afternoon, each lasting half an hour.

Zhao Hao divided his five disciples and Zhao Shizhen into three groups, and each person was asked to receive guests for half an hour every three days. This did not affect their studies, but also helped to promote science, and they did not have to pay them.

~~

The guards at the door invited the guests into the west wing which had been decorated overnight. There was a coal-burning stove in the room, as well as tea and snacks.

As soon as the Chen hour arrived, Wang Dingjue, who was to receive guests today, came out. Then, under the curious gazes of the guests, he began the first science lesson - 'Open your eyes and see the world'!

Yes, it was the lesson that Zhao Hao taught Eryang at Yuhuatai.

However, the content of the courseware has been adjusted. First, the part about looking at the moon at night was deleted, and the globe was not displayed either - this was a decision Zhao Hao made this morning.

This is Beijing, not the far-flung capital. Besides, Lord Xu is watching us. If things get too disruptive, something big will happen.

Well, in the early stage, you’d better develop slowly and don’t be reckless.

However, Zhao Hao added several interesting scientific experiments, such as "lighting a lamp in the water", "water flows upward", "rainbow in the water", "fishing coins in the oil pan", "kaleidoscope", "eggs floating on the water", etc.

These little experiments are both interesting and attractive, and the experimental props are ready-made.

When Zhao Hao has nothing to do, he will prepare a few and explain them to his apprentices so that they can have an intuitive understanding of the scientific concepts.

At this time, Wang Dingjue can just follow the prescription to get the medicine...

The guests saw him putting his hand into the boiling oil pan, and they couldn't help but gasp, and some even covered their eyes out of pity.

Wang Dingjue, however, took out a few copper coins as if nothing had happened, wiped his hands and explained to the guests that this was because the oil pan was half filled with vinegar. The boiling point of vinegar is much lower than that of oil, so the pan will boil when the temperature is not high, creating the illusion of boiling oil.

Through this experiment, the guests remembered what "boiling point" is, and different substances have different "boiling points".

Wang Xijue threw another raw egg into the bowl, and the egg slowly sank to the bottom of the water. Then he added two spoonfuls of salt, and after a while, the egg floated up again.

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

They also saw that the heavy iron box floated in the basin of water - this was even more shocking to them than "fishing for copper coins in boiling oil"!

It's made of iron!

This time, a young man dressed as a student asked, "Because the iron box is hollow, its density is lower than that of water?"

Wang Xijue looked at the young man with a little surprise, remembered his appearance, then smiled and nodded, "Density is equal to mass minus volume. Mass can be understood as weight, while volume is only related to size, solid or hollow. So the smaller the mass, the larger the volume, and the greater the buoyancy..."

"Doesn't that mean that even iron can be used to build ships?"

"Of course you can. As long as you follow this formula and make an iron ship with a density less than that of water, it will naturally float on the water." Wang Dingjue smiled faintly and affirmed, "This is the power of science."

“Great! Great!”

After witnessing the magic of science and understanding scientific calculation methods, the guests gradually became interested and all looked at Wang Xijue intently as he continued his lively and interesting science lectures.

Zhao Hao stood at the back door, looking through the door curtain at the people reading attentively inside, revealing a look of satisfaction like an old mother.

~~

Happy study time is always so short.

Unconsciously, an hour passed. Wang Dingjue put down the prism in his hand and said politely to everyone, "This morning's science popularization ends here. Please leave in an orderly manner."

"Can we still watch it in the afternoon?" the guests asked eagerly.

"You can go to the concierge to sign up. The maximum number of people per class is 30." Wang Dingjue said, and reminded everyone: "But the experimental project will not change in the short term. So if you have seen it once, please try not to come again, and leave the opportunity for more people."

After a pause, Wang Dingjue led everyone and said, "These are actually just small experiments in physics, and physics is only one branch of our discipline."

Of course, he would not tell them that he had only studied the Elementary Physics handwritten by Wang Wuyang by himself, and he only had a vague understanding of many parts...

But my master said that the most important thing for a teacher is to be as nervous as a dog inside, but as steady as an old dog on the outside. Only in this way can you keep the situation under control.

After seeing so many amazing experiments and knowing the reasons behind them, who wouldn't be eager to learn more about physics?

"It seems that I have to go back and read the Geometry book carefully." Someone rubbed his hands and said, "Come back after you understand it."

"Yes, this science is extraordinary. Not only can we conduct experiments, but we can also summarize the principles and...formulas. I think it will be very useful."

"Let's go back and read Geometry."

The guests returned to the street, took one look at the wooden sign that read "Those who do not know geometry should not ask to be my disciple", and left with an itchy heart.

Wang Wuyang stood at the door, looking at the crowd that kept turning back, and smiled to his second apprentice brother beside him: "People are like this, if something comes too easily, they won't cherish it."

"So Senior Brother cherishes me very much." Hua Shuyang said with a sly smile. He was always proud that it was easier for him to become a disciple than Wang Wuyang, and he often teased Senior Brother about this.

Wang Wuyang was really furious, and just as he was about to chase after him, he heard a question in Qinqiang behind him:

"Excuse me, what does it take to know geometry?"

ps. The third update is here, please give me monthly tickets and recommendation tickets~~~