MTL - Release that Witch-Chapter 19 Teaching

The first rain after entering the winter finally fell, and it was two days.

Roland leaned against his desk and looked out at the town outside the window. The rain was rolled up by the wind, and one by one was shot on the glass, causing ripples. Under the refraction of the ripples, the outline of the town becomes distorted. The extension of the house and the street is curved and deformed, and it will not be the regularity of the past. Due to the lack of effective drainage measures, the water flowing across the staggered stone roads is far from the river, and looks like a lot of rippled creeks.

The mountains and forests in the distance are covered by water mist, which is looming like a human world.

If such a landscape is put into modern times, it must be a tourist attraction, and now Roland wants to see the steel and cement jungle. The construction of the city wall had to stop when it rained, which made him a little bit fascinated by the joy of the last day to "persuade" the fortress.

"You just said that the air around us is made up of many gases, really?"

The clear voice interrupted Roland's thoughts, and Anna asked with her pretty blue eyes.

"Cough, Miss Anna, you should use honorific words when you call your Highness," the chief knight on the side reminded.

"Not so particular," Roland turned. "She is now my student." It was raining, he called the two witches and Carter to listen to his class - yes, he decided to open a natural Science popularization class. The work of the stone craftsman Carl School inspired him, even the stonemason can open the school, not to mention his own mechanical engineering dog. Why is there discrimination, is it because of ignorance? Universal education is the most effective means of promoting the development of civilization in any era.

He originally wanted to call the assistant to the minister. But the other party was busy with government affairs recently, and the rumor declined. Somehow, Roland felt that Barov was particularly motivated after the winter, and almost one person provoked the daily management of Bianbu Town.

When I heard new knowledge to learn, Anna immediately became radiant, and her eyes seemed to glow. Nana Wa saw that she didn't need to treat all kinds of experimental animals, and she was very happy. Carter was holding a pair of idle and idle, and came to listen to you with a good look.

But not long after the class started, the knight’s eyes were gone. Nana Va is also ignorant, staring at the words of nature and science. Although Anna seems to understand half of it, she still tries hard to write down everything she hears. Roland had to pause and let the three men digest for a while.

For Anna's question, he smiled and nodded. "Of course, although they look the same."

"His Highness, I don't understand, since it looks the same, how do you know that it is a different gas?" Carter questioned this.

"I can prove it to you."

Roland knows that if light is spoken in words, I am afraid that most people will be confused by these mysterious and mysterious theories. He decided to use a simple experiment to arouse everyone's interest.

A candle, a glass, a tub, a bowl of clarified lime water - this is something he prepared in advance, although the glass at this time is light brown, far less transparent than the later beaker, barely enough to use It is. After all, this simple test does not require observation of the change process.

Roland has done it beforehand. The test results prove that although the world has magic, the rest of the natural rules are still the same as the earth. He asked Anna to light the candle and stand it in the tub.

"Combustion requires the consumption of a gas. This gas is also closely related to all life. If we stop breathing, it will be like this candle. Look," Roland buckled the glass on the candle, and the flame swayed twice, soon. It is extinguished.

"It runs out of air, Your Highness, it's not surprising," the chief knight didn't take it for granted. "Without the air we will of course die, like falling into the water."

Nana Wa nodded.

"So, do you think there is nothing in the cup?" Roland asked to pour the lime water into the tub, the waterline quickly drowned the cup, and finally stopped at one-half of the cup.

This experiment is so classic that most elementary school teachers like to use it as an enlightenment test for natural interest classes. Roland still remembers the shock and shock that the teacher gave to the presentation and explanation at the desk, and he has embarked on the road of science and engineering.

He gently lifted the cup to the corner, and saw a few bubbles bursting out of the cup and popping out of the water.

Then, the clarified lime water showed a slight turbidity, and a little white suspension spread slowly from the mouth of the cup.

“If there is nothing in the cup, we will not see bubbles and changes in the water surface. This means that the air contains at least two different gases. In fact, the candle burns only a part of the air, while the other part cannot. Participating in the burning. Although it is as colorless and tasteless as the former, the nature is the opposite."

"Like... it seems like this," Carter thought for a long time to figure out the relationship between the two. "But what do you know about this?"

"If we can get the former gas, we can let the flame burn longer. Similarly, if you get the latter gas, you can quickly extinguish the flame!" Anna said suddenly.

It was a genius. Roland admired in the bottom of his heart. Although there was a small fallacy, he could immediately think of separation and purification from the different properties of the gas. This idea is absolutely genius. To know that she has not received any systematic modern education, it is enough to think that this is enough to show that her logic is beyond ordinary people - at least far better than her chief knight.

"It’s a good saying. Since humans have learned to use fire, they are separated from the animals, and the origin is just an accident. Perhaps the lightning ignited the trees, perhaps the stones that hit the bursting Mars caused the flame. But if no one noticed At this point, no one is trying to use it. We are still like the beast,” he said. “This experiment is to tell you that curiosity and thinking are the driving force for human progress. There are many such potential forces in nature. Wait for us to discover the use."

After some words, Carter is still a dubious look, and Nana Va is a type that is unclear and looks straight at Roland. Only Anna bowed her head and seemed to be thinking about something.

Well, Roland sighed, indeed, the idea of ​​being too advanced will not bring shock, it will only make people feel puzzled. The height of thought determines that they cannot understand the power of that power. Only when the real thing is really in front of them will they know how magical the hidden power in nature is.

At this time, the kettle hanging on the mantelpiece rang, which was the sound of steam hitting the lid.

"Ah, the water boiled," the knight walked over and took out the kettle with a fork, and the sound soon stopped. He wrapped the handle with a rag and lifted the kettle to fill the water in the cups.

For example, Roland reached for the cup and felt the temperature from the wall. From the first day the fire was used, its principles were ripe. "Boiled water", countless people have witnessed it, practiced it, but did not expect that this gently rising water vapor can also contain amazing energy.

This motive force, which will be mastered by humans hundreds of years later, has changed human history in a very short time. Although the principle is simple, it is limited to the process problem, and it is not the first choice for most people to farm. It can be different, he thinks, there are witches in this world. Using magic to kill the battle, but the idea of ​​the barbarian ... to use magic to create, to replace some of the key processes to contain the process of civilization, is the correct way to use.

After chatting about the sun setting and eating dinner with everyone, Roland returned to his bedroom.

There is no night life in this era. If you don't create people, everyone will sleep earlier. He also considered whether to use the prince's privilege to recruit a maid to do sports, but ultimately it was too thin to say.

Just lit the room candle, he heard a few applause from behind, and then someone spoke. "It was a special lecture. I didn't expect that the Four Princes was a scholar."

It is the voice of a strange woman. Roland’s cold sweat instantly came out, and strangers who could not be seen in their own houses, except what the assassin would be! ? He pulled his leg and rushed to the door. He hadn't had time to put his hand on the doorknob, and a cold wind swept from his ear. When he came back, a silver-handled dagger was firmly inserted on the door panel, and he was only one finger away from his cheek.