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Chapter 288 Those who don¡¯t understand geometry should not enter this door.

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

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

    ¡°After all, yesterday Zhao Hao only talked about the role of science, but only made general remarks about its content.  It's like people in future generations want to see the full movie after watching the trailer. Is it up to the standard shown in the trailer?

    However, when they inquired about the west gate of Zhao Mansion, they saw a huge wooden sign hanging on the doorpost of Guangliang Gate.

    There is a line of eye-catching characters written on it, 'Those who do not understand geometry should not enter this door'.

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

    Someone suddenly said: "One of the pamphlets I received at the entrance of Lingji Palace yesterday seemed to be called "A First Look at Geometry"."

    "Not bad." Wang Wuyang appeared in the doorway, cupped his hands towards everyone, and then explained loudly:

    "Geometry is an introductory subject to our discipline, but not everyone is suitable to be a scientist. In order to avoid wasting my teacher's and everyone's time, yesterday I specially distributed several copies of "A Preliminary Look at Geometry". Only those who can understand this book will be able to  Becoming a disciple of my master will teach you 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 popular science demonstration." Wang Wuyang pointed to the east door and said, "Everyone, go in through that door. Every day, my brothers and I will take turns to demonstrate scientific experiments for the guests."

    "That's it" the guests said, don't look at this small scientific sect, it is quite formal.

    So they walked to the east gate of Zhao Mansion, where there was indeed another plaque hanging on the doorpost.

    ?????????????? In addition to the four big words ¡°Science Popularization Demonstration¡±, there are also daily opening hours - one in the morning and one in the afternoon, each for half an hour.

    Zhao Hao divided his five disciples, plus Zhao Shizhen, into three groups. Each person came to receive guests for half an hour for three days, which would not affect their studies, but also promote science, and they did not need to pay wages.

    ??~~

    The guard at the door invited the guests into the west wing, which had been decorated overnight. There was a stove burning coal and lotus root, as well as tea and snacks.

    As soon as the hour came, Wang Dingjue, who was picking up the guests today, came out, and then, under the curious eyes of the guests, began the first lesson of popular science - 'open your eyes to see the world'!

    Yes, it was the lesson 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. This was a decision Zhao Hao made just this morning.

    This is the city of Beijing, not the capital where the sky is high and the emperor is far away, and Mr. Xu Ge is still keeping an eye on it. This is too subversive, and something big will happen.

    ¡°Well, it¡¯s still a wretched development in the early stages, so don¡¯t waste it.

    However, Zhao Hao added several interesting scientific experiments, such as 'lighting a lamp in the water', 'water flowing to higher places', 'rainbow appearing in the water', 'catching copper coins in an oil pan', 'kaleidoscope', 'egg floating on water', etc.  ¡­

    These small experiments are interesting and attractive, and the experimental props are all ready-made.

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

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

    When the guests saw him putting his hand into the boiling oil pot, they couldn't help but gasp, and some even couldn't bear to cover their eyes.

    Wang Dingjue took out a few coins as if nothing had happened, and while wiping his hands clean, he explained to the guests that it was because half of the vinegar was added to the oil pan.  The boiling point of vinegar is much lower than that of oil, so it 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 liquids 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 spoons of salt, and after a while, the egg floated again.

    Through this experiment, the guests learned what ¡®density¡¯ is. The higher the density, the greater the buoyancy.

    They also saw a heavy iron box floating in the basin - this was even more shocking to them than "boiling oil to fish for copper coins"!

    That¡¯s made of iron!

    This time, a young man dressed as a supervisor rushed to answer and asked: "Because the iron box is hollow, is the density lower than water?"

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

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

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

    "awesome!"

    Seeing the magic of science and understanding scientific calculation methods, the guests gradually listened in. They all looked at Wang Xijue intently as he continued to conduct lively and interesting science popularization.

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

    ??~~

    Happy learning time is always so short.

    Unknowingly, an hour passed. Wang Dingjue put down the prism in his hand and smiled politely at everyone: "This ends the science popularization in the morning. Please leave in an orderly manner."

    ¡°Can we still watch it in the afternoon?¡± the guests asked, still wanting to know.

    "You can go to the concierge to sign up. The maximum number of people in a class is thirty." Wang Dingjue said, and reminded everyone: "However, the experimental project will not change in a short period of time. 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 and said, "These are actually just small experiments in physics, and physics is just one branch of our discipline."

    Of course, he will not tell them. In fact, he has only studied on his own. In the "Elementary Physics" handwritten by Wang Wuyang, he barely understands many parts

    "But Master has said that the most important thing about being a teacher is to be as calm as an old dog on the outside even though you are panicking like a dog in your heart. Only in this way can you calm down the situation.

    The guests then left the house in dismay.  Having seen so many magical experiments and knowing why they happen, who wouldn¡¯t be itching to learn more about physics?

    "It seems that I have to go back and look through the "Geometry" book." Someone was eager to say: "Come back after you understand it."

    "Yes, this science is extraordinary. Not only can you do experiments, but you can also summarize principles and otherformulas. I think it is quite useful."

    "Let's take a walk and go back and read "Geometry"."

    The guests returned to the street, took a look at the wooden sign that said, "Those who don't know geometry should not be apprenticed" and dispersed with itchiness.

    Wang Wuyang stood at the door, looking at the crowd who kept turning back, and smiled at the second junior brother beside him: "That's how people are, if they get it too easily, they won't cherish it."

    "So senior brother cherishes it very much." Hua Shuyang said with a mean smile.  He has always been proud that it is easier for him to become a disciple than Wang Wuyang, and he often makes fun of his elder brother.

    Wang Wuyang was indeed furious and was about to chase him away when he heard a question with a Qin opera voice coming from behind him:

    "Excuse me, you two, what does it mean to know geometry?"

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