I got carried away, I really got carried away.

A beautiful woman asked a question, and Shen Guanglin unconsciously answered something beyond his expectations.

There are many ancient human sites in China, such as Yuanmou in Caiyun Province, Zhoukoudian in the capital, and Lantian and the like.

Everyone has learned the article "People from the Capital" since they were young, and the textbook also specifically depicts the entire process from ape to human. This is the result of many years of education.

Now, Shen Guanglin has broken the stereotype and said that our ancestors originated in Africa. No one wants to believe it, at least emotionally it is unacceptable.

Even 40 years later, there are still many scholars who study history and social sciences who firmly refuse to acknowledge biological genetic relationships. They insist that we are humans that developed independently from apes.

It's only 1982, and no one or any institution has yet verified Lucy's DNA and mitochondria. We can't yet draw the conclusion that humans have the same origin.

Now I heard Shen Guanglin say: Our ancestors migrated from Africa.

The audience immediately exploded.

"It's nonsense, it's just nonsense!" Some teachers couldn't help it on the spot.

"Humans came from Africa 200,000 years ago, so where did the Zhoukoudian people go? Don't tell lies with your eyes open!"

It was also just after the movement era, and the way everyone expressed their opposition was more direct and not subtle at all. One teacher started to contradict him on the spot: "Teacher Shen, you have to speak responsibly. As a physics teacher, you should not express biology. That’s the point of view.”

"That's right, that's right. He has no hair on his lips and can't do his job well."

There was a lot of discussion in the audience.

Shen Guanglin wasn't angry either, and stood quietly waiting for them to calm down. With this kind of demeanor, he felt particularly graceful.

This is indeed a difficult problem. It is really difficult for Shen Guanglin to explain it, at least not at once. He can only wait for everyone to calm down before continuing.

Seeing that little girl Yang Ling was still standing, Shen Guanglin waved his hand for her to sit down first, and then he began to talk slowly:

"I have two arguments here. Even if you are not a student of biology, it is not difficult to understand. We all know that our human ancestors are close relatives of chimpanzees. If all of us are independent from ancient chimpanzees, Evolved, then why are there no reproductive isolation among various human races around the world? But we are reproductively isolated from chimpanzees, which is unscientific."

After Shen Guanglin finished speaking, he paused for a while and asked everyone to think carefully.

As long as you are not a gangster, you should be able to figure it out. If all the ancient apes are divided into two groups, one of which can independently evolve into humans, and the other evolves into chimpanzees, then why does this branch evolve into humans? There is no reproductive isolation from each other.

What Shen Guanglin said made sense, and the audience was indeed much quieter.

"Precisely because we humans are not reproductively isolated from each other, it means that our ancestors must have the same origin, at least from the same line of great apes that separated from chimpanzees."

The audience finally stopped being so noisy.

What Shen Guanglin said does make sense, and the idea of ​​a common origin is still tenable.

However, everyone is still unconvinced: "That doesn't mean that human ancestors originated from Africa. Yuanmou Man is 1.7 million years old and can travel all over the world."

Shen Guanglin thought for a while and began to formulate his own ideas: "In 1924, Australopithecus apes dating back 3.9 million years ago was discovered in South Africa. This is the earliest great ape discovered so far. This is one of the evidences that humans originated in Africa. one.

Also, 75% of the land in Africa is located between the Tropic of Capricorn and the Tropic of Cancer. It has high temperatures all year round and does not have four seasons, so it can maintain a stable evolutionary environment. If the temperature is too low and the four seasons change, then the sweat glands on our bodies will not It will be so developed, and the hair on the body will not shed so cleanly."

This is all evidence. Everyone still doesn't believe it, but they are already doubtful.

Shen Guanglin's statement is a bit far-fetched, but it is logically consistent and there is nothing wrong with it.

"In the future, an advanced measurement tool will be developed that can quickly identify DNA and genetic material. In this way, we will be able to distinguish the differences between species and the differences between individuals. This is a method that is better than checking fingerprints. It’s a magical technology, and with it, a lot of crime will be reduced.”

So magical?

Shen Guanglin continued: "With this technology for testing DNA, we will be able to clearly know where humans originated. Now these only represent the opinions of one family, and they are only inferences and can only be corroborated."

"Then if genetic material can be tested, can we identify the biological parents?" Someone in the audience finally asked this question.

"Yes, this classmate, you are right. Paternity testing technology is also an important application of DNA testing technology."

...

Finally, get out of class is over.

People are like iron, and food is like steel. You must not drag the class down just because your classmates love you.

The school has a staff cafeteria, and the quality of the food is better than that of students. After dinner, Shen Guanglin took a nap in the professional classroom of the physics building, and then the beautiful girl came over again.

"Hello, Teacher Shen."

"Hello, classmate, what's your surname? Do you have a problem with me?" Even though he was woken up, Shen Guanglin was still very kind and did not show any anger.

"My surname is Yang, and my name is Yang Ling. I study astrophysics. I have a question I would like to ask Teacher Shen."

Being good-looking is a privilege.

"you say?"

"Is there extraterrestrial life? When can we land a man on the moon?"

Shen Guanglin could not answer these two questions, because when Shen Guanglin traveled through, the country had not yet achieved manned moon landing, but the space station had been built.

"First of all, there is no life in the solar system except the earth. Among the eight planets in the solar system, only the earth has the best conditions, followed by Mars, and the other planets have even worse conditions."

"Isn't there nine planets? Teacher, you missed one."

"I did not underestimate it. In fact, Pluto is not a planet, but a dwarf planet at most. Because its mass is too small, in the solar system, its movement is not only affected by the sun, but also affected by the gravity of other planets. Moreover, it There are also other asteroids or meteorites running in its orbit, which shows that its gravity is weak and inadequate."

"Then why do the international community still name nine planets?"

"I will suggest that they change it at the next meeting."

You don’t have to wait for the next meeting, just this time.

In less than a month, there will be an international conference in Brussels, Belgium.
Chapter completed!