What humans can't do.

From a scientific point of view, there are very few things that human beings can't do, and this epidemic has made us understand that there are actually many things that human beings can't do, such as not coming back to life, because we can't get people back from the epidemic. There are some things that other humans can't do. Let's have a look.

What humans can't do 1 1, go back to the past.

Can humans cross? How to understand crossing? This is a question that many people often think of.

In people's consciousness, crossing often means going back to the past, such as playing mud with neighbors when I was a child, such as going back to ancient times to experience ancient poems and so on. But unfortunately, scientists say that humans can travel to the future, but they can't go back to the past.

Einstein's theory of relativity can easily lead to such a wrong understanding: when a person walks at the speed of light, he sees that everything around him is static, and nothing will change at this moment, just like a movie suddenly stops; But what happens when he walks at superluminal speed? Does this mean he can go back in time?

The answer is no, scientists say that human beings can only go to the future and cannot go back to the past. That's because when you walk at the speed of light, your time will become very slow, and human time on earth has not changed. So, you think you've only been gone for a year. In fact, for human beings on earth, you have been gone for hundreds of years.

If you want to go back in time, it's impossible. If you want to go to the future, it's easy. You only need to travel in space for a year by taking a rocket flying at the speed of light or 10%. In a year, you will return to the earth. When you open the cabin, you will be surprised to find that you have come to the earth hundreds of years later.

Step 2 come back to life

People can't die! There are no immortals. That is inconsistent with the phenomenon of birth, aging, illness and death in nature. The structure of nucleic acids in genes, we know the secret of how people die.

The human gene arrangement structure is composed of two groups of nucleic acids, forming an end-to-end chain. When a cell replicates a group of genes, the two ends of the genes can't be well aligned. When two groups of nucleic acids combine, two groups of nucleic acid particles will fall off.

So once human cells divide, the particles at both ends of nucleic acid will fall off. The more times the cell divides, the shorter the nucleic acid chain will be, the weaker the regulatory signal sent by the gene will be, the lower the working efficiency of all parts of the cell will be, the aging speed will be accelerated accordingly, and the human body will die.

No matter how technology develops, it can't compare with physical illness and death. Maybe one day human beings can prolong their life, but they can't come back to life.

Step 3 get rid of gravity

People who live on the earth are always down-to-earth because of the centripetal gravity of the earth. No matter where you are on the earth, you can always keep your feet on the ground.

But people can't get rid of the bondage of gravity and live, because people in the space station always follow this big turntable in the external coordinate system, and only when they are still in the space station coordinate system do they jump in the opposite direction.

In fact, compared with the external coordinate system, people just slow down with the rotation speed of the turntable, and the centripetal force will become smaller, which will definitely produce a short-term sense of weightlessness, but this is the same as the sense of weightlessness when jumping up and falling off the earth.

Only when the take-off speed is greater than the tangential speed of the turntable, people may be "suspended" outside the space station, but people can still see the turntable rotating at high speed, but people will not fall again, just like rockets on the earth can stop falling to the ground when they reach a certain speed.

What humans cannot do 2 1. The greatest pain in life is that you always make the wrong choice when you know what is right. You can never cross the huge gap between knowing and doing.

If I can't do it myself, students will see a great hypocrisy in you and have an ideal sense of disillusionment. What really affects the students around us is not only words and deeds, but more importantly, setting an example.

Remind students not to take the arrogance of a legal person. In my opinion, this arrogance is actually just a manifestation of ignorance.

4, life, there are many setbacks, life also has a lot of pain, but you, you have to respect yourself. The most important thing for you is to do what you think is right. The most important thing is to look up to you now after many years. Each of us is an indomitable spirit.

If you can calm down and read one or two classics a year, this year will be very meaningful. Talk to the great human soul and get out of your prejudice. We should accept universality and diversity. Recommend Plato's utopia.

6. There is nothing to make up for your anxiety and fear about uncontrollable things. Your anxiety can't change tomorrow, but it will affect your mood today, and your fear can't change tomorrow, because the only thing you should fear in life is fear itself, but it is controllable whether you can make good use of your time for controllable things. You should be careful and temperate, because if you are not careful, you will be extremely sad. Today is a gift. Let's have fun.

Be cautious about controllable things, be optimistic about uncontrollable things, and people can only do what they can. You must accept this fact and be optimistic about it. -epiktetos

You care too much about the past and worry too much about the future. There is a saying that yesterday is history, tomorrow is unknown, and today is a gift from heaven. Cherish today as a gift. -"Kung Fu Panda"

7. We think that poverty means hunger, being naked and having no house. However, the greatest poverty is that we are not needed, loved and cared for.

8. I think the biggest pain for people is that they can't cross the gap between knowing and doing. It can only be that your actions are one step faster than your words.

9. Walk in the real world, get in touch with real people and live a real life.

10, the people you can really influence must be the people you are willing to invest a lot of time in t a and have real contact with.

1 1, love concrete people, not abstract people; Love life, not the meaning of life. Dostoevsky (talk less/do more/surf the Internet less/live more)

12, science has no moral restrictions, and mankind will eventually be destroyed.

Gandhi once said that poverty is the worst kind of violence.

The seven things that destroy mankind are:

1, wealth needs no labor;

2. Happiness without conscience;

3. There is no understanding of right and wrong;

4. Business without morality;

5. Science without humanity;

6. Worship without sacrifice;