In addition to teaching his children to count, he only taught the three numbers of 1, 2 and 3, which originated in ancient India and were later named "Arabic numerals", which are much easier to write than letters.

The students are relatively clever and have no obvious intellectual deficiencies, and if they are calculated, they should exceed the average, so it is easier to learn this kind of thing that is closely related to their lives than to abstract letters.

Counting is even simpler, these students are over thirteen years old, they have a certain life experience, counting is a teaching, less than half an hour, this math class, will complete the predetermined teaching content.

Li Zicheng saw that it was still early, so he planned to popularize scientific knowledge to students, but he did not have a complete teaching knowledge system at all, so he planned to release all kinds of early scientific knowledge he knew in the form of entertainment in the form of small stories.

"Ladies and gentlemen, it's still early for school to get out, and Mr. will tell you some stories!"

"Story?" The students whispered suddenly, they had never heard of Mr. telling stories in class, in the Ming Dynasty, where there were almost no entertainment programs, stories were equivalent to folk drum books, almost the same as singing, which could attract attention.

The students were all sitting upright, and Li Zichengfang said slowly: "A ripe cherry, if it continues to hang on the branches, will automatically rot after a while, do you know what the reason is?" ”

"Eaten by birds!" A student blurted out without thinking.

Sun Mengjie didn't say anything, but she frowned and looked thoughtful.

"Haha," Li Zicheng laughed, the student's thinking was fast enough, "but if the cherries are picked and put at home, they will also rot, so what's the reason?" It can't be eaten by a cat, right? ”

"Hahaha......" The students were all laughing, I don't know if they were amused by Li Zicheng, or if they were laughing at the student just now.

Li Zicheng waited for the students to gradually calm down, and said: "The cherries have indeed been stolen and eaten!" ”

"Huh?" The students are stunned one by one, which is not in line with their daily life experience, ripe cherries will rot, which they have heard or seen, but they are not stolen and eaten by anyone, even if they are not stolen and eaten, the cherries themselves will rot.

But Li Zicheng is now a gentleman, they can't be ridiculed, so they wait to see the jokes, see how Li Zicheng justifies himself, maybe what kind of trap Mr. is setting, when artists say big drum books, this is often the case.

"However, it is not a certain person who steals cherries, let alone our common birds and rats," Li Zicheng said, "but a small thing called bacteria." ”

"Bacteria? What's that little thing? Why haven't you heard of it? ”

"I've never seen any bacteria!"

Someone was even bolder, "Is it a fabrication of the gentleman?" ”

Li Zicheng pressed his hands downwards and motioned for the students to be quiet, "You may not have heard of it, but bacteria are real." ”

"That'...... Where can I find germs? Mu Sirong stared at her bright big eyes, her beautiful eyelashes blinked one after another, as if Li Zicheng was telling a fantasy story, and there was clearly a trace of distrust in her eyes.

"It's a pity that you can't see bacteria," Li Zicheng shook his head and sighed, "The creatures in the world, what we can see, can be boiled down to two categories: plants and animals, such as flowers and plants, trees, thorns and other plants. ”

"Sir, that animal can run, think tigers, goats, cows and horses, etc., right?" Mu Sirong did not sing against Li Zicheng this time, but followed Li Zicheng's train of thought and played a front station for him.

"Si Rong is right!" Li Zicheng gave her a thumbs up.

Although Mu Sirong is not a daughter, she grew up in a wealthy family since she was a child, and she knows a few words, so she naturally attaches more importance to her name than ordinary women, hearing Li Zicheng say her name in public, her face turned red, and she was a little annoyed in her heart, but then she thought that Li Zicheng was now a gentleman, and she was relieved, but she didn't dare to ask questions for the time being.

Li Zicheng continued: "These animals can be divided into two categories, one is herbivorous animals, such as our common cattle, horses, sheep and rabbits; The other category is tigers, leopards, wolves, eagles, etc., which feed on small animals and are called carnivorous animals. ”

“……”

"Herbivorous animals eat grass, carnivores eat herbivorous animals, so who will eat carnivores?"

"Is it bacteria?" Mu Sirong muttered to herself.

"Si Rong got it right!" Li Zicheng stretched out his thumb to her again, this girl is really good.

Mu Sirong's face was red again, but this time she didn't think much about it, she just stuck out her tongue secretly.

"If there are no bacteria, then after the death of the animal, there will be a large number of corpses on the ground, although carnivores, flies, and moths will also consume a part, but that is only a few, and a large number of corpses still rely on bacteria," Li Zicheng paused, and said: "All the decay occurs due to bacteria eating, and it is they who consume the corpses of animals." ”

"How does the gentleman know that there are bacteria?"

This is an obvious distrust of themselves, and it is no wonder that they can't see bacteria at all, their own words, basically subvert their daily life experience, Li Zicheng replied: "There is a large animal, called the Komodo dragon, like a crocodile, a crocodile you have never seen, like a gecko, but much larger than a gecko, weighing up to two hundred pounds, this animal predation method is very special, they are usually not like tigers and leopards, hunting animals, but waiting in the place where other animals are infested, the opportunity comes, rush up and take a bite, And then left! ”

"Is the prey dead?"

"No, at least not for the time being," Li Zicheng said with a smile: "But once the prey is bitten by the Komodo dragon, it is not far from death, the saliva in the mouth of the Komodo dragon contains a large number of bacteria, if these bacteria enter the body of the prey, they will soon let the prey be infected and die, the Komodo dragon followed the smell, found the corpse, and began to eat." ”

"Huh? It turns out that bacteria can still kill? ”

"Bacteria eat not only the carcasses of animals, but also live animals, including humans." Li Zicheng exaggerated the action of eating.

"Huh?" Someone exclaimed, "Aren't we dangerous?" ”

"Even though we have germs in our bodies and mouths......"

"Ah......" Before Li Zicheng finished speaking, someone had already exclaimed, Li Zicheng hurriedly added: "You don't have to worry, the human body itself has some protective organs, and they will automatically kill the bacteria that enter the body, so you just need to wash your face and hands often and keep it clean, and you don't have to worry too much." ”

The class fell silent for a while, but after a long time, Chen Qiudie asked, "My lord...... Sir, is there really any bacteria? ”

"Of course there are bacteria." Li Zicheng was speechless, and dared to say that until now, he was playing the piano to the cow.

"Then why can't the student see the presence of bacteria?" Chen Qiudie saw her right hand from her left hand, and then from her right hand to her left hand, and touched her little face.

"Don't look at it, you can't see it," Li Zicheng said with a smile: "The bacteria are too small to be seen with your eyes!" ”

"That'...... Have you ever seen bacteria, sir? ”

Once Li Zicheng gives a negative answer, I am afraid that the students will think that he is just telling a story, and even deliberately sensational, thought about it, and said: "Mr. has really seen bacteria, that was when he was in Jingshi, there was a Westerner, with a thing called 'microscope', placed on the street of Jingshi, let the people in the past watch, another day Mr. is free, see if you can make a microscope, let you experience it for yourself." ”

"If you make a microscope and let students see bacteria, students will believe in the existence of bacteria." Mu Sirong whispered.

"It seems that Mr. still has to spend some effort to make you believe in the existence of bacteria," Li Zicheng shook his head and sighed, however, this spirit of seeking truth from facts is not a bad thing for scientific research, but the scientific knowledge that he popularized today is not touchable and invisible, and it is a little abstract. ”

Li Zicheng returned to the back office, and just after lunch, He Xiaomi rushed to the palace, "My lord, my subordinates found a house in the city, the house is big enough, it's just ...... It's just that it's not facing Beimen Street, do you want to see it for yourself? ”

"Oh? Check it out! Li Zicheng immediately set off, took He Xiaomi and five personal soldiers, and came to the house He Xiaomi said.

Turn right from Beimen Street, it is Caocheng Lane, about 100 steps forward along Caocheng Lane, there is a courtyard, which is the goal He Xiaomi said.

Facing is a two-room shop, Li Zicheng enters from the shop, behind is a wide courtyard, at the back of the courtyard, there is a three-room earthen thatched house.

Li Zicheng is quite satisfied, especially the courtyard, which can store distilled liquor in the future, the three thatched huts in the back can be used as workshops, and the two in front will be used as shops in the future, just to sell distilled spirits, "The fragrance of wine is not afraid of deep alleys, millet, the whole courtyard, how much silver is in total?" ”

"Back to my lord, the seller wants two hundred and sixty taels, if the adult can see it, he can lower it!"

"You don't need to lower the price, just two hundred and sixty taels!" Li Zicheng walked out of the courtyard slowly, "Xiaomi, immediately arrange for the brothers to clean up the courtyard, and let the two craftsmen from the official office move in as soon as possible!" ”

Back at the official office, Li Zicheng entered the study of the central government and looked at the messages sent from all over the country, most of the information, Li Zicheng only had to read and know it, but there were two pieces of information, which attracted his special attention.

After pondering for a long time, Li Zicheng finally put down the message and called a personal soldier, "Let Lord Liang and Liu Baihu come over immediately!" ”