I don't know that two and a half years have passed since I returned from my trip to Sun City.Although that is not a long time for us, two and a half years is a long time for the little runt.Many dwarfs also went on a trip to Sun City after hearing all the things introduced by Don't Know, Little Thumbtack, Little Dirty Bag, and Painted Face. After returning, they decided to make some improvements to the city's construction.Since then, Huacheng has become unrecognizable.Many new, large and very beautiful houses appeared in the city.On Bellflower Street, two rotating buildings were built according to the design of the architect Xiao vertical bottle.One is a tower-shaped five-story building with a spiral slide, and a swimming pool is built around the building. You can dive directly into the water by sliding down the spiral slide.The other is a six-story building with swaying balconies and a skydiving stand and magic disc on the roof.There are also countless cars on the streets: screw cars, roller coasters, hydraulic aerobikes, crawler buggies, and a whole host of other vehicles.

Of course, the changes are far more than that.The residents of Sun City heard that the dwarfs in Huacheng were doing construction, so they all came to help them and helped them set up several so-called factories.Following the designs of the engineer Rivet Hammer, a large garment factory was built, producing a huge variety of garments, from rubber corsets to synthetic winter fur coats.Now no one has to work hard with a needle and thread to sew the most ordinary trousers and jackets.Everything the dwarfs need is made by machines in the factory.Like Sun City, the finished products are distributed to various stores, and everyone goes to the store to get what they need.All the factory workers had to worry about was figuring out new clothing patterns and taking care not to produce something the masses didn't like.

Everyone is very satisfied.Only Little Bread has suffered in this regard.Little Bread saw that he could go to the store to get everything he needed, and he was puzzled to think, what is the use of the huge pile of clothes accumulated at home now.Besides, the styles of these clothes are not fashionable anymore, and they are useless anyway, so Xiaobao chose a dark night, packed all the old clothes into a big bag, quietly took them out of the house, and threw them into the cucumber river , and got a lot of new clothes from various stores.As a result, his room seemed to have become a garment warehouse.Clothes are piled up in the closet, on the closet, on the table, under the table, and on the bookshelf, hanging on the wall, hanging on the back of the chair, and even hanging from the ceiling with ropes.

Because there are so many woolen clothes, moths are born in the house.In order to prevent the moths from biting the clothes, Little Bread had to sprinkle sanitary balls every day. As a result, the room was filled with a strong smell of camphor, and even the dwarfs who were not used to this smell could be overwhelmed.Little Bread himself also exuded this dizzy smell all over his body, but he got used to it and couldn't smell it anymore.However, others are not used to this smell.As soon as Little Bread went to someone's house as a guest, the owner was immediately intoxicated and dizzy.The family immediately drove the buns away, and opened all the doors and windows to ventilate the room as soon as possible, otherwise, they would be stunned or go crazy.For this reason, Bread couldn't even play with the dwarfs in the yard.As soon as he arrived in the yard, everyone around him would spit, cover their noses with their hands and run around desperately.No one wants to associate with him.Needless to say, this embarrassed Bun, and he had to put all the clothes he didn't need in the attic.

However, this is not the main thing.The main thing is that Jack-of-all-trades has also been to Sun City, where he met the female scientists Fuchsia and Little Herring.At the time, the two men were preparing for a second mission to the moon.Know-it-all also participated in the construction of the space rocket, and after the rocket was built, he went on an interstellar journey with Fuchsia and Herring.After our brave travelers flew to the moon, they inspected a small lunar crater in the bright sea area of ​​the moon, and went to the cave in the center of the crater to observe the change of gravity.As we all know, the gravity on the moon is much smaller than that on the earth, because the station.Observing changes in gravity is of great scientific interest.Know-it-all and his companions were on the moon for about four hours before they had to start back as soon as possible because they were running out of oxygen.Everyone knows that there is no oxygen on the moon. In order not to be suffocated, you have to carry an oxygen bag with you.Concentrated oxygen, of course.

After Wan Shitong returned to Huacheng, he talked a lot about his travels on the moon.Everyone was very interested in his introduction, especially astronomers who had observed the moon more than once with astronomical telescopes.The surface of the moon is not flat but mountainous, and many mountains on the moon are not like the mountains on our earth. For some reason, they are all round. To be more precise, they are all round. is circular.Scientists call these ringed mountains lunar craters or lunar valleys.If you want to understand the appearance of round valleys or craters on the moon, you can imagine large circular land masses with a diameter of 20, 30, 50 or even 100 kilometers long, and then imagine these circular land masses. The large land is surrounded by earth embankments or mountains with a height of only two to three kilometers—this is what a round valley or a lunar crater looks like.There are thousands of such craters on the moon.The small ones are only two kilometers in diameter; the large ones can be as long as one hundred and forty kilometers in diameter.

The question of how and how lunar craters were formed has interested many scientists.All the astronomers in Sun City even quarreled with each other to solve this complicated problem.They are divided into two factions, one believes that the lunar craters are formed by volcanoes, and the other believes that the lunar craters are traces left by the fall of giant meteorites.The former group of astronomers is therefore called the supporters of the volcano theory, referred to as the volcano theory; the latter group is called the supporters of the meteorite theory, referred to as the meteorite theory.

However, the know-it-all disagrees with neither the volcano theory nor the meteorite theory.Still before he traveled to the moon, he created his own set of theories about the formation of lunar craters.Once, he observed the moon with the astronomical telescope together with the glass plate, and found that the surface of the moon was quite like a pancake with many small holes that was baked moderately.Since then, Jack-of-all-trades has often visited the kitchen to observe pancakes.He found that the surface of the pancake was completely flat when it was raw, but when it was baked on a baking pan, some small bubbles formed by the hot steam began to appear on the surface.As the temperature rises, the air bubbles on the surface of the pancake burst, and some shallow pits are formed on the pancake. When the pancake is cooked, these shallow pits remain.

Wan Collusion even wrote a pamphlet in which he wrote: The surface of the moon has not always been as hard and cold as it is now.At a time long ago, the Moon was a large ball of hot liquid.Later, the surface of the moon gradually cooled and became no longer liquid magma, but sticky like dough.It's still hot inside, so some huge bubbles formed on the moon's surface as the hot gas escaped.These bubbles naturally burst after escaping the lunar surface.When the surface of the moon was still liquid, the bubbles after bursting would leave no traces, just like the bubbles on the surface of water when it rains do not leave any traces.But when the surface of the moon is cooled down to be as soft as dough or as waxy as melted glass, the traces of the bursting bubbles will no longer disappear, but will form a raised ring on the surface of the moon.As the moon grew colder, the rings finally solidified completely.At first the rings were even, like circles of condensation on the surface of water, and then they gradually broke down and turned into one of those lunar craters that anyone can see with an astronomical telescope.

All astronomers—whether volcanologists or meteorites—laughed at the jack-of-all-trades theory. Volcanoists said: "Since it is already clear that the craters of the moon are volcanoes, what is the use of this pancake theory?" Know-it-all replied that a volcano is a very large mountain with a small caldera, or hole, at the top.If any of the lunar craters is the caldera of a volcano, the volcano itself would be almost the size of the entire moon, and this phenomenon is not actually seen at all. The meteorite theorist said: "Of course, the lunar craters are not volcanoes, but they are not pancakes either. Everyone knows that they are traces left by meteorite impacts.

To this point, Know-it-all replied that the meteorite could fall on the moon not only vertically, but also obliquely. In the latter case, the traces it left would not be round, but oblate, oblong, Or rather oval.However, the craters on the moon are basically round, not oval. But both the Volcanoist and the Meteorist have become so ossified in their favorite theories that they refuse to listen to the know-it-all, and call him a pancake theorist contemptuously.They said that the comparison of such a huge celestial body as a sourdough pancake was ridiculous in itself. However, he himself abandoned his pancake theory after he himself went to the moon and inspected a lunar crater up close.He observed carefully that the crater was not a mountain at all, but the remains of a large brick wall that had collapsed over time.Although the wall bricks have weathered and lost their original rectangular shape, it can still be seen that they are precisely bricks, not ordinary rock blocks.This is especially evident where the brick walls have not fallen so long ago that the individual bricks have not yet been reduced to powder. Know-it-all thought it over, and he realized that these brick walls could only have been built by some kind of intelligent creature.After he returned from his travels, he published a small book, which said: A long time ago, there was a kind of intelligent creature on the moon, the so-called moon dwarf.Or Moon Man.In those days there was air on the moon as on the earth now.Therefore, the lunar people live on the surface of the moon, just like we live on the surface of our planet, the earth.But the air on the moon is getting scarcer, escaping into the surrounding space.In order to prevent themselves from dying for lack of air, the moon people built thick brick walls around the city and covered it with a huge circular glass roof.Because of these domes, the air can't fly away, so you can breathe, and you don't have to be afraid of anything. However, the people on the moon know that this will not work for a long time.The air around the moon will eventually disappear completely, and the surface of the moon without the protection of the air layer will be exposed to strong sunlight. At that time, it will not be possible to live on the moon, even under the dome of glass.It is for this reason that the lunar people began to migrate to the inside of the moon. Now they live not outside the moon, but inside the moon, because the inside of the moon is actually empty, like a ball, inside it. It can live as comfortably on its inner surface as it does on its outer surface. The know-it-all little book was a sensation.All the dwarfs read the book with great interest.Many scientists praised this small book as interesting, but some people objected that it had no scientific basis.Professor Little Xingxing, a regular member of the Academy of Astronomical Sciences, also read the little book written by Know-it-all, and he was so angry that he said that it was not a book at all, but—in his words—bullshit, and that Professor Little Xingxing Not a particularly angry person.No, he's a pretty nice little guy, but, how can I put it, he's a serious guy.In all things he placed great importance on its accuracy and order, and could not tolerate any illusions, that is, any fictions. Professor Little Xingxing suggested that the Academy of Astronomy arrange a meeting to discuss the little book of know-it-all, and said that it should be thoroughly criticized so that no one would dare to write such a book in the future.The Academy of Sciences agreed with the proposal and extended an invitation to Know-It-All.Know-it-all comes to the Academy of Sciences for a seminar.According to the usual practice, this seminar will have a report first, and the report will be made by Professor Xiao Xingxing himself. When all the dwarfs who were invited to participate in the seminar gathered in the spacious hall and took their seats, Professor Little Xingxing stepped onto the podium.The first thing you hear him say is: "Dear friends, allow me to announce that the meeting to discuss the little book of know-it-all is now open." After Professor Little Xingxing finished speaking, he cleared his throat loudly.Unhurriedly wiping his nose with a handkerchief, he began to make a report.He briefly described the contents of the know-it-all book.Praising the writing for its vividness and clarity, he went on to point out that Know-it-all made a mistake by mistaking what was actually not a brick but a flaky rock.said the professor.Since there are no bricks, there are no moon dwarfs, and there can be no moon dwarfs.Even if there were, they could not live on the inner surface of the moon, because it has long been known that all objects on the moon, like those on our earth, are attracted by the center of the planet. A person can live on its inner surface, and he will be sucked into the center of the moon at once, and wander helplessly in the moon until he starves to death. After hearing these words, the know-it-all stood up from his seat and said sarcastically: "You make such a judgment, as if you have been floating in the center of the moon!" "You seem to have wandered before?" the professor retorted. "I haven't floated," retorted Passepartout, "but I have flown in rockets, and observed objects in weightlessness." "What does this have to do with weightlessness?" the professor muttered. "It does," said Know-it-all. "Listen to me. When I fly in a rocket, I have a bottle of water. When the weightlessness occurs, the bottle floats around in the cabin like everything that is not fixed to the bulkhead. It is full of water. When drinking water, everything is normal. But when I drank half of the water, something strange happened: the remaining water in the bottle did not stay at the bottom of the bottle, nor did it gather in the center of the bottle, but along the As a result, a bubble is formed in the bottle. That is, the water is not attracted to the center of the bottle, but to the wall of the bottle. This is also understandable, because only solid substances can attract each other. , and the empty place attracts nothing." "You're so wrong!" Little Xingxing blamed angrily. "Compare a bottle to a planet! Is that scientific, in your opinion?" "Why not science?" the know-it-all replied with great assurance. "When the bottle floats freely in interstellar space, it is in a state of weightlessness, like the planet in every respect. What happens inside the bottle is exactly the same as what happens inside the planet, that is, the moon. Of course, If the inside of the moon is hollow." "Yes, yes!" Little Xingxing immediately took over and said. "Then explain to us why you insist that the moon is hollow inside?" The audience who came to the meeting laughed, but the know-it-all was not embarrassed by this. He said: "If you think about it for a while, you must think so. The moon turned out to be a big hot liquid ball. The cooling starts not from the inside, but from the surface, because it is the surface of the moon that is in contact with the cold space. In this way, the surface of the moon is first cooled and solidified, and as a result, the moon seems to have become a Huge spherical vessel, which still contained—what contained? . . . " "Uncooled liquid substance!" someone in the audience shouted. "Yes!" the passer-by replied. "Contains a liquid-like substance that has not yet cooled, simply put, a liquid." "Look, you also said it's liquid," Little Xingxing said with a sneer. "Since the inside of the moon is liquid, how can it be hollow? You fool!" "Well, it's not hard to think of that at all," replied Passionate without anger. "Isn't the fiery liquid surrounding the moon's crust continuing to cool, and shrinking in size as it cools. You probably know that any matter that cools loses its volume?" "I guess I know that too," muttered the professor angrily. "Then you ought to understand it all," said Passionate, cheerfully. "Since the volume of the liquid matter has shrunk, a space will naturally form inside the moon, just like the bubbles in a bottle. This space in the center of the moon is getting larger and larger, because the matter that is still in the liquid state It is attracted to the hard shell of the moon, just like the water left in the bottle is sucked to the wall of the bottle when it is in a state of weightlessness. Over time, the liquid inside the moon completely cools and solidifies, as if stuck to the hard shell of the planet. wall, and as a result a cavity is formed inside the Moon which may gradually fill with air or some other gas." "Correct!" someone yelled. Immediately there were shouts from all directions: "Correct! That's right! Good job, know-it-all! Ulla!" People applaud.Someone shouted: "Little Xingxing get out!" Immediately two dwarfs grabbed Little Star—one by the collar, the other by the leg—and dragged him off the platform.A few dwarfs lifted the jack-of-all-trades and carried it to the pulpit. "Let the know-it-all report!" shouted the people from all around. "Tell Little Xingxing to go away!" "Dear friends!" said the know-it-all, coming to the pulpit. "I can't give a report. I'm not prepared." "Talk about the flight to the moon!" cried the little ones. "Talk about the state of weightlessness!" Someone shouted again. "Talk about the moon! . . . about weightlessness!" the know-it-all repeated in panic. "Okay, so let's talk about weightlessness. As you probably know, a space rocket must have a great velocity—eleven kilometers per second—to overcome the gravity of the Earth. When the rocket accelerates, your body feels the load." It is very big. Your weight seems to have increased several times, and there is a force that presses you to the floor of the cabin. You cannot lift your hands or legs, and you feel as if your whole body is filled with lead. You feel as if there is A terrible weight presses down on your chest, leaving you breathless. But as soon as the acceleration stops, the spaceship begins to fly freely in interstellar space, the heavy load disappears, and you no longer feel gravity. Simply put , which means losing weight.” "How do you feel? How do you feel?" someone shouted. "The first thing I felt when I lost weight was that the seat had been quietly removed from under me and I had nowhere to sit. I felt like I had lost something, but I couldn't figure out what it was ...I felt a little dizzy, as if someone had turned me on my head on purpose. At the same time, I felt as if everything in my body was frozen and cold, like when I was afraid, although I didn't Fear. After a while, I was convinced that nothing bad happened to me, I was breathing like normal, I could see everything around me, and I was thinking normally, so I ignored the pressure in my chest and abdomen. And This uncomfortable feeling also went away on its own. I looked around and saw that everything in the cabin was in its place, the seat was still under me as it was before, and I no longer felt turned over on my head After a while, my head is not dizzy..." "Talk! Go on!" the little dwarfs stopped talking when they saw everything was clear, and shouted in unison. A few dwarfs even stomped their feet impatiently. "That's it," went on the Know-it-all. "As soon as I was convinced that everything was perfectly normal, I tried to get up on the floor, but I did it so quickly that I rushed up and hit my head on the roof of the cabin. You see, I didn't realize that my body had lost weight. I can jump high and high with a little effort. Because my body is weightless, I can take any posture and float freely in the cabin, neither falling nor rising, but be careful. The movement should not be violent. Things that were not fixed before we set off were all floating freely beside me. When the bottom of the bottle is upside down, the water cannot be spilled out. If the water in the bottle is shaken out, the water will gather Some small balls are also floating around in the air until they are sucked to the bulkhead." "Excuse me," asked a little man. "Is that water in your bottle, or is it some other drink?" "Ordinary water in the bottle," the know-it-all answered curtly. "What other drink can I have?" "Well, I don't know," said the little man, spreading his hands. "I thought it was sweet soda, or kerosene." Everyone laughed.Another dwarf asked, "Did you bring anything back from the moon?" "I brought back a small moon rock." Know-it-all took out a small blue-gray stone from his pocket and said: "There are countless kinds of stones piled up on the surface of the moon, and they are all beautiful, but I don't want to take such a stone, because it may be from the universe. A meteorite that accidentally fell on the moon in space. And this rock was knocked off a cliff with a hammer when we were walking into the moon cave. So we can be absolutely sure that this rock is a small piece of real moon rock .” This small piece of moon rock is passed around in people's hands.Everyone wanted to take a closer look at it.While the Dwarfs were passing the stones and examining them, the Know-it-all told of his travels on the moon with the Fuchsia and the Herring, and what they had seen.Everyone loves to listen to the know-it-all.Everyone is very satisfied.Only Little Xingxing was not satisfied.As soon as the know-it-all finished speaking, he stepped off the podium, and Professor Little Xingxing jumped up and said: "Dear friends, we all listened with great interest to the presentation about the moon and everything else, and on behalf of all of you here, I would like to express my heartfelt thanks to the famous know-it-all for his witty and informative presentation. But  … ..." Little Xingxing said, and raised his index finger up with a serious expression. "Go away!" shouted someone among the dwarfs. "But..." Professor Little Xingxing repeated with a raised voice. "But our gathering here is not to listen to the introduction of the moon, but to discuss the little book written by Know-it-all. Since there is no discussion of the little book, it means that the planned plan has not been completed. Since the planned plan has not been completed, then we should still put The plan is completed, since it should be completed, it should still be completed and considered..." No one figured out what Little Xingxing wanted to discuss.There was such a commotion that nothing could be heard clearly.The same words were shouted everywhere: "Go away!" The two dwarfs jumped onto the podium again, and one grabbed the little star by the collar.Another grabbed his feet and dragged him straight down the street.They let Little Xingxing sit on the grass in the park in the middle of the street, and said to him: "You can speak on the stage after you fly to the moon. But now sit on the grass." Little Xingxing was so rudely treated that he was too angry to say a word.Later, he regained his composure and shouted, "That's unreasonable! I want to sue! I want to write an article for the newspaper! You will know about Professor Little Xingxing!" He shook his fist and shouted like this for a long time, but when he saw that the little boys had gone home, he said, "I declare the meeting closed." After speaking, he stood up and went home.