This was because the microscope in the maze was based on magic. Unlike the microscope on Earth, it was not difficult for a microscope to observe multiple targets at the same time. This maze could even do things like the dissecting microscope on Earth, making the observation sample appear three-dimensional.
However, Fen did not intend to use such a complicated operation. The second sample she was going to present was the leaf that she asked the little apprentice to pick. With the same simple and neat movements, she skillfully took out the membrane under the epidermis and put it on the stage after the same treatment.
With a sample of an animal and a sample of a plant, Fen explained the characteristics of the various parts of the cells and the differences between animals and plants. In order to let everyone have a clearer understanding of the cells, she also took the epidermis, blood, and other things from someone and introduced them. It made someone feel like he was being treated as a lab rat, and this lab rat had to help control the images in class.
Of course, it would not take too long just to learn the cells of animals and plants. After all, the academy in the maze did not have the pressure of exams like the schools on Earth. Therefore, from time to time in class, the teachers would say things like, "This is the key point, and there will be exams in the future."
Teaching in the maze was more like giving a briefing on Earth. The teachers would talk about the key points and then provide a lot of information. This was the new insight of a certain someone after several mathematics classes.
In particular, the people who came to this advanced class were all mages with a solid foundation, not the kind of apprentices who had just received enlightenment. As for those who could become official magicians, their memory and comprehension abilities were not to be underestimated. Simply put, it was the feeling of teaching a genius. It was no wonder that teaching in the Holy City would be so embarrassing that one would be kicked out.
The definition of a good teacher was also very simple. It was either that the new content was shocking enough or that the new content was too much for others to digest. A teacher who could do both of these things was a good teacher in the eyes of these geniuses.
Therefore, after talking about the basic differences and types of animal and plant cells, Fen directly introduced the cells of all parts of the human body. She included the differences and uses of each cell, the uses of the organs formed by the cells, and the uses of the body system formed by these organs.
Then, there was a happy thing. The following introductions were all done with pictures prepared in advance instead of being collected on the spot. Because of this, a certain someone escaped the fate of being dismembered.
However, although this new knowledge was novel, it did not touch the calm hearts of these old mages. Everyone studied in class calmly and quietly transcribed their notes. Of course, a certain someone had guessed this from the very beginning. After all, the mages in the Mystic Lands were all practical. If it was too purely academic, it would be hard for people not to wonder what was the use of learning it.
Therefore, when there were only 30 minutes left in the first life class, Lin suggested that the syllabus change slightly. Fen's ability to control time is also very accurate. Even if she doesn't look at the pocket watch – the magic gold pocket watch made by someone a long time ago, which is still one of the Lich's spoils of war, alas – or the clock, she can still say one hour and thirty minutes after the class starts:
"The above is an introduction to the cells in various parts of the human body. Including humans, as long as one could see living things in the Mystic Lands, they could be classified as multicellular organisms. In other words, every living thing was made up of thousands of cells with different functions. So the question was, did single-celled organisms exist? It's the kind of creature that has the ability to move and reproduce as a single cell. "
Without waiting for anyone to answer, Fen asked again: "Does anyone here have water?"
Although no one answered, the mages didn't open their mouths to chant an incantation. They easily cast the first circle apprentice spell, Water Gathering, and condensed water balls in the air.
"Sorry, everyone, I didn't make it clear. What I need is drinkable spring water or water from a well, not water created by magic. "
The water balls in the air silently dissipated. One of the mages picked up a sheepskin water bag and said: "This is spring water from the Spring of Elves in the forest. Can this water be used?"
The spring water from the Spring of Elves was one of the specialties of the Holy City of Estali. It was said that long-term consumption would increase the speed of a mage's accumulation of power. But people who didn't drink it well or drank it too much would have symptoms of resistance.
"Yes, that's great." Fen took out an empty petri dish and said to the mage who spoke: "Please pour some into this petri dish."
Although the spring water from the Spring of Elves was expensive, but the small petri dish didn't seem to contain even a mouthful of water. The mage who brought the spring water didn't care about it and directly poured it half full.
"Okay, everyone, this is spring water from the Spring of Elves. Let's take a look at what's inside. "
After returning to the podium, Fen didn't do anything to the water in the petri dish and directly put it on the microscope's stage. She would do the rest of the operation herself instead of letting Lin, who was her assistant, do it. The operation wasn't just a simple microscopic magnification, but also the analysis and comparison function of the program. Looking at the constantly updated data on the water mirror screen, Fen said with a smile: "Hehe, the world in the water is really wonderful."
The speed of the analysis was very fast, and it was completed in a short while. Fen said: "The water in the petri dish is between three and four milliliters. Some different kinds of microorganisms were detected, but most of them are in small quantities. However, the most abundant is this. "
At this time, the water mirror screen showed a large number of long, rod-shaped bacteria without spores.
"— Escherichia coli, it mainly parasitizes the large intestines of animals. Some strains are probiotic, they can produce substances needed by the human body and prevent the growth of other pathogenic bacteria. However, some strains can cause food contamination, causing the consumer to develop symptoms of food poisoning. Common symptoms are vomiting, abdominal pain and diarrhea. In addition to the intestines of organisms, they mostly exist in fecal contaminated environments. "
When Fen's speech came out, everyone was in an uproar.
What a joke! This was the Spring of Elves, one of the most popular items for Wizards in the Holy City. It could be used as a material for making props, and could also be drunk directly. The person who provided the Spring of Elves wasn't an unknown young man, but a well-known veteran Wizard. Therefore, it was impossible for him to come up with a fake product, nor would he deliberately deceive people.
The water in the small glass dish was poured out of the sheepskin bag in front of everyone's eyes. Although it was brought to her strange machine by the Lich for inspection, but under the watchful eyes of everyone, there was no opportunity to tamper with it.
Then, what was the matter with saying that there was something in the water that could poison people? It even had something to do with feces!
In the class where only Fen was performing, someone finally spoke. The first question was, "Madam Fanny, are you sure you're not mistaken? How could there be something in the Spring of Elves that could poison people? I have never heard of anyone dying from drinking the Spring of Elves. "
"What do you think 'poison' is? Something that can cause death by simply eating it? Let me introduce another concept here, the amount that can cause death. Everything has poison, but the question is, how much does one have to eat to cause death? Some things are highly toxic, even if it's just a bit of powder, it can cause death if it touches the mouth. However, some things aren't like that. For example, slow acting poisons, they will continuously accumulate in the body. When the accumulated amount reaches a certain level, it will cause a disease in the human body, and cause death. Although the mechanism of disease isn't exactly the same as poison, there are still some things that can be used as a reference. "
"What do you mean, miss?"
"These single-celled organisms, I call them bacteria. Bacteria are everywhere, but after ingesting them into the human body, they can be too much or too little. If the amount is too little, the human body's immune system will automatically eliminate these pathogenic bacteria. But if the amount is too much to eliminate, they will cause symptoms in the human body, which is the so-called illness. As for what you said, has no one ever experienced any physical discomfort after drinking the Spring of Elves? In particular, the characteristics are similar to what I just described. "
"This …" The mage who asked the question was at a loss for words. Because the symptoms that Fen mentioned just now were actually the symptoms of resistance from those who were unsuitable. In the end, he could only barely defend himself: "Is this all just an assumption?"
Fen wasn't angry at the questioning of distrust, as well as the doubtful looks from the others. Instead, she nodded to Lin and began to show him pictures.
The first picture was of a half-abandoned village, with corpses lying everywhere. The few people who seemed to still be alive were also in a miserable state. The dead didn't die from war or magic beasts. Their faces and bodies had abscesses of different sizes, and the ends of their limbs were black.
With just a glance, the people present recognized this disease. It was the infamous Black Death – the plague.
"This is the record I left behind when I happened to hear that there was a plague somewhere during my travels and went to observe it. Most people believe that the infection is spread by rats. In fact, there are two vectors of infection. In addition to rats, there are also fleas, but they only serve as a bridge for the transmission of the disease. The main cause of the disease is … "
Lin changed the picture at the right time.
"… Yersinia pestis, very similar to the E. coli shown before, but the bacterium is longer and segmented, belonging to the Bacillus bicoccus. The cause is excessive rainfall after a drought, which led to the growth of plants and the proliferation of herbivores and insects. Rats, because of the increase in food, also multiplied in large numbers, exceeding the number that can be controlled by the supplements for rats, and then the disaster expanded. The prevention method is to prevent rats, exterminate rats, and eliminate fleas. Don't get close to infected people to avoid further infection. … "
The next picture was of a ruined village. Similarly, there were dead people, but unlike the villages that died from the plague, the faces of the dead here were haggard, as if dried up.
"… This is another village infected with a type of plague, which I call cholera. The main characteristics of the infected are dysentery, dehydration, vomiting, muscle twitching, and other phenomena, which then lead to sunken eye sockets, cold, damp skin, and lack of elasticity. The main way of transmission is through water or food contaminated with feces. The prevention method is simply to isolate the infected and drink clean water. The main cause of the disease is … "
Another picture was changed.
"… Vibrio cholerae. The bacterium is short, but has a single flagellum, pili, and some capsules. There are no good treatment methods. The only thing to pay attention to is to avoid dehydration. Therefore, you can only continuously replenish water and wait for the patient to survive. "
After that, Lin continued to show several types of plague-level infectious diseases, as well as the bacteria of the main lesions. This time, the mages couldn't sit still!
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