The old dean smiled and said, "I'm afraid, why aren't I afraid? To be honest, I was so scared at that time. I also knew that I could survive by surrendering. But there was nothing I could do. Look behind it, that's our country, and our fellow villagers live there. If I'm afraid and surrender, they will go and kill our fellow villagers."

"That's definitely not possible. Even if I die, I can't let them go. I rushed over and fought with them for bayonets. It's not me that I brag, my waist was cut and my intestines came out. I didn't retreat. In the end, I killed all the two enemies."

The bloody scene described by the old dean brought great impact to the fashionable and young children, including Xu Zhenghua. He didn't understand how the old dean did it at that time.

How scared that, how could he resist and not retreat?

The old dean must be lying.

But as he got older, Xu Zhenghua gradually understood.

The old dean did not lie.

It turns out that there are really some people who can be afraid of any fear, even the fear of death, because they have faith to support them.

Faith is something above everything else.

The old dean's belief is to repel invasions, defend his country, and liberate all mankind. For this belief, he is not even afraid of death.

"So...what is my belief?"

Xu Zhenghua thought silently.

As he thought about it, this question became clearer and clearer.

His beliefs were inherited from the old dean.

The old dean contributed his life to the cause of liberating all mankind. Now, human civilization has been invaded again.

Although he did not pay much attention to the current situation and was only obsessed with scientific research, he still knew what the situation was like at this moment in just a few words.

It is called cooperation, but it is actually a vassal. And it is unknown whether it can continue in the future.

"The old president has the belief of the old president. His belief supports him in the face of the threat of death and never take a step back when facing a strong enemy. I also have my belief. The old president can overcome fear, and I can overcome fear."

"I don't want to see human beings continue to be enslaved, I don't want to see civilization sinking, I don't want to see countless people lose their most basic dignity and die in despair and pain. I can't tolerate these things happening. In order to change all this, I would rather give my life..."

"I'm afraid of death, but I can't be scared by death."

The mind, which was slightly distracted by fear, suddenly condensed at this moment.

Fear came like a tide, but it could no longer affect Xu Zhenghua.

He took a firm step forward. Then, in an instant, the wonderful characters that merged into a ball in his mind suddenly exploded, and some things that Xu Zhenghua had been looking forward to were nurtured.

He felt every cell and every nerve in his body cheering.

Countless days and nights of hard work and countless days and nights of hard pursuit, finally fruitful fruits were born at this moment.

He found the most important breakthrough.

Virtual particles are virtual particles.

Virtual particles are an explanatory concept established in the mathematical calculations of quantum field theory, referring to mathematical terms in certain microscopic physical processes. They do not really exist, they are a means of conceptualization.

If a single particle is detected, it means that it exists for a long time to make it impossible to become a virtual particle. That is, all particles that can be observed are not virtual particles, and all virtual particles will never be observed.

The most well-known form of existence of virtual particles comes from Hawking radiation.

Hawking radiation is a theoretical concept about black hole evaporation. It is expressed in popular science language, which means that virtual particle pairs are constantly born out of thin air in the vacuum of the universe. One virtual particle has a positive mass and the other virtual particle has a negative mass. After a very short period of birth, they annihilate each other and return to invisible. Therefore, it does not violate the law of conservation of mass and energy at the macro level.

If a black hole happens to exist near the birthplace of virtual particles, this may happen: virtual particles carrying negative mass fall into the black hole, causing the mass of the black hole to decrease. Virtual particles carrying positive mass cannot be annihilated and can only radiate outward, which looks like a black hole is emitting radiation, resulting in a decrease in mass.

But this is actually just a popular science language and is not rigorous. It is just a figurative description of a certain "uninvestigated" process. In order to facilitate calculation, the concept of virtual particles was proposed.

Quantum mechanics has such a strange characteristic: it avoids thinking about internal mechanisms and only explores observable and perceptible aspects.
Chapter completed!