Leeuwenhoek didn't find any little humans in his semen, but he saw countless tadpoles swimming around.
It was not until 200 years later, in 1875, that humans finally figured out the secret of reproduction.
That year, a biologist observed the sexual reproduction process of sea urchins, and finally understood what fertilization was like. He knew that the tadpoles under the microscope were not small animals, and there were no miniature people inside, but a group of sperm.
They must meet and combine with the egg to give birth to a child.
It all started with Leeuwenhoek. The high-power microscope he made greatly expanded human vision. We finally knew the secret of human inheritance.
During the European Renaissance in the 16th century, influenced by Watt's invention of the steam engine, the first revolution in human medicine occurred, prompting the transformation of traditional medicine into therapeutic medicine. Therapeutic medicine compares people to a machine. When the machine is broken, it needs to be repaired.
When you get sick, you need to treat it. Therefore, therapeutic medicine is also called mechanical medicine, clinical medicine, and passive medicine. Its essence is: treatment of the disease.
The second revolution in medicine occurred at the end of the 19th century. Due to the relatively developed transportation, frequent wars, and epidemics of various infectious diseases, this situation promoted the rise of microbiology and immunology and triggered the second revolution in medicine.
The second revolution is the emergence of preventive medicine. Preventive medicine, especially specific prevention, is the vaccination and prevention of known diseases. For example: smallpox, cholera, plague, typhoid, etc..."
Next, I began to briefly talk about the development history of medicine, and then extended to the great contributions made by the ancestors of Jiangnan Medical University in the medical profession.
Finally, I said: "Now let's go back to the issue I talked about at the beginning: tradition and rebellion. If we carefully study every successful person, we will find that there is a rebellious spirit in their souls.
There is, they do not believe in so-called authority, do not believe that everything in books is correct, but have the courage to explore boldly, use their own minds to think, and use their own actions to verify.
In this way, countless scientific giants have been created in the history of our human civilization."
Having said this, I looked at everyone and smiled, "Before I started the lecture today, I told the school leaders that I was a little nervous today, and the school leaders asked me: Didn't the cadre meeting you held before have so many people?
I replied: There are almost that many people, but they are more obedient than students."
The people below suddenly laughed.
I continued: "So, before the end of today's lecture, I think I should briefly talk about the difference between natural science and social science. As I said before, those of us who engage in natural science research need a rebellious spirit, but those who engage in natural science research need a rebellious spirit.
You must follow the rules.
Maybe my statement is not very rigorous, so let me extend it further: each of us lives in this society, and we must follow the rules when we get along with others.
For example, after graduating from college, everyone will be assigned to be a doctor in a certain hospital. You say you want to be rebellious, and the director of the department asks you to examine the patient. The patient clearly has abdominal pain, but you insist on examining the patient's head first. Then you, a doctor
Just pretend it's not long, let alone the hospital that won't want you anymore, even the patients will beat you up."
Everyone laughed again.
I continued: "So, tradition and rebellion, rules and innovation, this is a mutually reinforcing relationship. We should rebel and innovate on the basis of pursuing the truth. This is the direction that each of us should adhere to...
"
I gave the entire lecture for about two hours. At the end, I said: "Thank you all for coming to listen to my lecture today. I hope I didn't waste your time.
I will try my best to arrange the next lecture on today next month. I will give a preview of the lecture first. The content of the next lecture is: Motherland’s Medicine and Philosophy of Conduct.
Abstract: Western medical anatomy can only understand the basic structure of the human body from the formed human body, while Chinese medicine not only knows the formed human body well, but also the unformed fetus.
For example: "The first month of pregnancy is like white snow, the second month is like peach blossoms, the male and female are separated in the third month, the image is formed in the fourth month, the muscles and bones are formed in the fifth month, the hair grows in the sixth month, the right hand is moved in the seventh month and the mother is left; the left hand is moved in the eighth month.
, is a daughter, on the right side of her mother; she turns around on the third day of the ninth month and is satisfied in the tenth month.
The application of motherland's medicine in forensic medicine can also play a great role. For example: if an aborted baby dies after being shocked in the mother's womb, the unborn baby will inevitably have purple-black clothes and weak blood;
If the fetus dies outside the abdomen, its corpse will be light red, without purple-black or white afterbirth.
The preview for the next episode is over, thank you all!”
There was endless applause below, and Principal Song finally concluded my lecture.
At this time, I suddenly discovered that there was a familiar face in the audience below, that was Udon Mei.
I didn't notice her at first, because it was then that I realized that she had lost a lot of weight. If I didn't pay attention, I wouldn't have recognized her. But I was sure it was her, and the look in her eyes said it.
everything.
But I quickly looked away because Chenchen was sitting below.
The principal came to shake hands with me warmly and said to me: "Mayor Feng, your lecture today was wonderful. You see, your lecture was not only warmly welcomed by the students, but also reciprocated by our teachers."
High praise. Their warm applause says it all.”
I said goodbye to them after a few polite words. To be honest, I was very excited at this time. I never thought that during the lecture, the things I had read would emerge in my mind in an endless stream and in an orderly manner.
In my mind, I can pick it up at my fingertips and use it flexibly.
When I left, I had a feeling: Udon Mei was watching me not far behind me, and we...
I was terrified in my heart, and then I got in the car with Chenchen and left.
After getting in the car, Chenchen said to me: "Your lecture today was really good."
I was thinking about the appearance of Udonmei I saw just now, wondering what happened to her recently? Why has she become so thin? At this time, I suddenly heard Chenchen's words, and I was shocked and hurriedly
He calmed down and said with a smile, "Really?"
She asked me: "Are you really not prepared? I think you don't even have a manuscript."
I said: "Actually, there is no need to prepare. The things I talked about today are all the knowledge accumulated in the past, and they can be used naturally when I talk. I am a medical student and my memory has been trained, so this
It’s not that difficult.”
She smiled and said: "That's it. I liked your lecture today.
When I was studying, I also listened to lectures given by school leaders and teachers. None of them were as good as you. By the way, the preview you gave at the end today is very novel. Maybe this is the first time that a lecturer has used such a method.