"The earth is round?" The students couldn't understand how their eyes were rounded.
Zhu Youjian sent ten globes to the students. The students immediately divided into dozens of small groups. The teachers in the back row also joined the ranks of the students, groping for the globes with their hands, worried that it would be broken, just like children playing. Firecrackers are both love and fear.
Zhu Youjian does not prevent the curiosity, doubts and speculations of teachers and students. This is the strongest spark that guides students and even teachers towards scientific research.
"All the students have seen it, this is the earth we live on-it is indeed round." Zhu Youzhen's words immediately suppressed the students' discussion.
"Teacher, but I see that the place where we live is very flat!" a student said weakly.
"This classmate asked very well. The place where we live really looks flat. That is the earth we live on is too big and our sight is not far enough-you are all deceived by your own eyes." Zhu Youzhen did not forget the quiet last moment.
"Teacher, how can we know that the earth is round?" The student just now was reluctant. It seems that he has the potential to pursue the truth.
"Of course I can prove it to you-Who among you lives on the seashore? Has anyone ever seen a sailboat returning from afar?" Zhu Youjian looked among the students. With.
"I, I." Several students raised their hands, and Zhu Youjian felt that they were not from Fujian, but Guangdong. They had a very strong dialect. Could it be that Hokkien and Cantonese existed in the Ming Dynasty
"Then I ask you, when you stand on the seashore and see the sailing ship returning home, do you see the mast of the ship first, or the hull first, or the whole ship at the same time?" Yili convinced people, Only by relying on facts can students develop their scientific spirit and stimulate their interest in scientific knowledge. Perhaps among them, there may be a few great navigators like Magellan and Columbus.
"Mast, it's a mast, I have seen it by the sea..." a student said while thinking, and finally came to a conclusion.
Among the students who raised their hands just now, several students nodded in agreement.
"I saw the whole ship at the same time, I remember it clearly." A student retorted.
"What you said is correct," Zhu Youjian will never discourage students' enthusiasm and curiosity. "If the mast on a boat is too short or the area of the water is too small, for example, the boat is in a river, we will see it at the same time. The whole ship."
Zhu Youjian picked up the chalk mixed with lime and clay, drew a round sphere on the blackboard, and drew a boat and a person next to the sphere, "Look, because the earth is round, so stand People on the shore will see the mast first, and then the hull. If the surface of the earth is flat, the person standing on the beach should see the entire hull directly.” Zhu Youjian has drawn a picture. A straight line, compared with the sphere.
Simple and easy to understand, clear and clear.
The students are still digesting the sketches drawn by Zhu Youjian.
"If you have the opportunity to go to the beach and carefully observe the sailing ship returning from a long voyage, you will believe that the earth we live on is indeed round; if there is no chance to go to the beach, it does not matter. Someone has proven this great discovery--- ---- There is a country in Europe called Spain, and there is a person in Spain called Magellan, who has had experience of traveling around the world. Under the guidance of a compass, he sailed from west to east, and finally returned to the place where he started. You say , Is the earth round or flat?"
With the guidance of the globe, the students are still chewing Zhu Youjian's words, and it is difficult for them to digest all this knowledge for a while.
The students in these geography classes may not become Newton or Galileo, but as long as they persist in their interest in geography and their research direction, Zhu Youjian believes that a navigator will appear in Ming Dynasty sooner or later.
The rise of Europe did not originate from the Industrial Revolution in Britain, nor from the Renaissance in Italy, but from the great nautical discoveries in Portugal and Spain.
When the class was about to end, Zhu Youjian emphasized: "Classmates, I am not a professional geography teacher. Therefore, the maps and globes given to you are inaccurate. It is up to you to draw accurate maps of Daming, and even the world. "
In the second chemistry class, Zhu Youjian asked the guards to bring a large wooden food container to the podium.
"What is chemistry? The teacher must have told you, I won't repeat it. For example, the cement used for road construction is made by chemical methods, and the ceramics are made by firing, and this." Zhu Take out a beaker from the inspection box and place it on the podium.
"Crystal?" the student in the front row whispered.
"This is not crystal, but glass." Zhu Youjian corrected. "This is glass that was fired not long ago."
"Glass? What is glass?" Only a few students have heard of glass. Most students have seen such pure glass for the first time. After all, Daming has no newspaper, no TV, and no Internet.
Zhu Youjian took out some glass tubes, beakers, and jars. "These are all glass, but their firing methods are different from those of ceramics and cement. Let's use these glasses to do two experiments. Let the students Look, what are chemistry and chemical changes."
All the students in the class were silent, with wide-eyed eyes, even the teachers who were listening.
Zhu Youjian took out a beaker filled with water from the food box, and inserted a glass tube into the beaker. "Which of you is interested? Come up and do an experiment?"
A boy in the front row slowly walked onto the podium.
"You go through this tube and blow hard into the cup to see what happens to the water in the cup." Zhu Youjian glanced at the student who looked a little serious.
The student held the catheter in his mouth, bulged his cheeks, and exhausted his strength to blow into the cup, but there was no change in the water.
"Oh, I'm sorry, I took the wrong bottle, it should be this bottle." Zhu Youjian took out a beaker filled with water from the food box again, "This classmate, you try again."
The student, who was just a little embarrassed, blew with force.
"The water became muddy." After a while, the students in the front row noticed the change in the clear water, and he shouted excitedly.
The unclear crowd in the back row began to agitate and began to squeeze forward. Even the blowing student put down the catheter. He wanted to see what happened in the cup.
"It's also a glass of clear water. The glass hasn't changed just now, but now it is milky white. Why?" Zhu Youjian paused, "Because the last glass is not clear water, but lime water."
Zhu Youjian explained the principle of the reaction of lime water with carbon dioxide in the air to produce water and calcium carbonate. "Daming, Guangdong, Guangxi, Jiangnan and other places have world-famous stalactites. This is the reason for the formation of stalactites."
The thinking of students swims from inside class to outside class, and from outside class back to class.
"Do another experiment. I would like to ask students, how can you fry raw eggs with your life experience?" Although Zhu Youzhen has not been a teacher, he knows from the experience of the students, questioning, experimenting, solving puzzles, Induction is the most basic way to learn chemistry.
"Of course it is with fire." There were more than one or two students who answered this time. It seems that these students are not people who do not eat fireworks.
"But, I can fry eggs without fire." For safety, Zhu Youjian asked the students in the front row to move back.
"The students are optimistic, this is an ordinary egg." Zhu Youjian took out an ordinary white porcelain bowl from the food box, and then took out a fresh egg. In order to convince the students that this is not magic, he put the egg in it. Let the students take a closer look.
When the student returned the egg to Zhu Youjian's hand, he opened the egg in front of the student and poured it into a porcelain bowl. "Look, I can fry the cooked egg with just a glass of water."
Zhu Youjian took out a thin-necked bottle with a lid from the food box, and the bottle was filled with water.
Under the gaze of the students, Zhu Youjian poured the "clear water" from the narrow-necked bottle into a porcelain bowl, and then quickly retreated to a safe distance.
The "clear water" in the porcelain bowl immediately boiled and made a "crack" sound. In a quiet classroom, the "crack" sound could reach the back seat.
When the porcelain bowl was silent like a classroom, Zhu Youjian stepped forward and took a look. Hey, the egg was really cooked, and there were some black spots on it.
"Classmates, come up and see if the eggs are cooked, but don't touch the porcelain bowl, let alone taste it with your mouth-I forgot to put the salt."
The students had forgotten that Zhu Youjian was the emperor, and they swarmed towards the podium as usual.
"Come slowly, line up, and pay attention to safety." After Zhu Youjian's reminder, the students read the cooked eggs in the porcelain bowl one by one.
After the students read it, they couldn't help but curiosity. The teachers in the back row also leaned forward. They saw the eggs really cooked, and returned to their seats in surprise.
"Couldn't it be clear water in the cup?"
"How come this bottle has a cap, but the other bottles don't."
"Why can't hard-boiled eggs be eaten? Is it really because there is no salt?"
…
The students talked a lot, as if the teacher asked them to discuss in groups.
"Students, your observations are very careful, and your judgments are also very accurate. The slender bottle is indeed not clear water, but a substance called sulfuric acid. When it encounters clear water in eggs, it can release a lot of heat, just like It’s the same as grilling on fire, so the eggs are cooked."
The performances of the students were different. Some were holding their cheeks and looked thoughtful; some were flushed with excitement. They were eager for Zhu Youzhen to do some more experiments like this, something they had never heard of before. Experiment; some sit quietly in the sitting position, waiting for Zhu Youjian to follow.
"Chemistry is extensive and profound, and I can't learn all the knowledge thoroughly. There is still a lot of knowledge that you need to explore. For example, the output of Daming iron reaches more than 200 million catties, but you can't make a Lumi gun. Why? Because Ming can't make good steel."
Zhu Youjian had long hoped to improve Daming’s smelting level, and hoped to produce fine steel and refined copper, which would lay the foundation for the development of Daming’s heavy industry. However, Zhu Youjian was the emperor and could not have much time for scientific research unless he Willing to be like Song Huizong and Tang Empress.
So Zhu Youjian seized the opportunity and founded the Daming Academy of Sciences.
So Zhu Youjian came to the Academy of Sciences to teach in person today.
It is impossible to create a master of science in one lecture, but since the seeds have been planted, as long as they are properly watered and fertilized, Zhu Youjian believes that one day, it will grow into a towering tree.
After leaving the Academy of Sciences and just returning to the Palace of the Qing Dynasty, Sili Bingbi eunuch Zhang Yixian followed: "Your Majesty, Liaodong Army Daily."
"Ao? What good news does Liaodong have?" Zhu Youjian has become accustomed to Liaodong's victories one after another.