"Isn't time 'passing'? Is he trying to say that he can travel back in time? That's too old-fashioned, this is not a popular science work, it has become a vulgar time-traveling book. He's not going to be pandering to the dog's blood for sales, is he?"

With this vigilance, Ma Yiyi continued to look down.

Thankfully, the rest of the story wasn't what she expected.

Gu Play still writes very rigorously.

“…… Looking at the universe from the perspective of most physical quantities, we can find that the state is actually reversible. For example, if we know the position, velocity, and force of a certain celestial body at a certain point, we can not only calculate where it will appear and what state it will be in six months after it is launched, but also work backwards to calculate where and what state it was in half a year ago. This concept is called 'inversion' in physics.

Regardless of the macroscopic or microscopic state, everything but one quantity in the physical world can be inverted. There is only one quantity that cannot be reversed, and that is entropy increase. According to the second law of thermodynamics, the entire universe will continue to evolve towards an increasing entropy trend.

Regardless of whether a certain part can change from disorder and chaos back to order, but on the overall scale of the universe, the total amount of chaos and disorder is increasing. Just as in order to reunite a broken mirror, more energy must be consumed than is released when the mirror is broken.

Therefore, time is just a description of how fast and slow entropy increases after humans invented the concept of entropy. However, the concepts of order and disorder are originally the expression of human macroscopic observation of the world, rather than the natural existence of physics.

It's like a new deck of playing cards that have just left the factory, originally in the order of all hearts first, followed by spades, third clubs, and fourth diamonds.

Assuming that human beings can only observe the "suit" and cannot observe the "points" in the macroscopic state, they will think that this initial setting is "orderly", and the state of mixing and matching the four-color suits after shuffling is "disorder and chaos".

However, if we can see more evaluation dimensions under microscopic quantum observations, let's assume that it is called 'points', maybe after shuffling the cards we can see such a state: although the suit is scrambled, the cards become straights with small to large points. In the process of the gradual chaos of the suit, the points gradually ordered.

This is not to say that entropy increases do not exist, but that chaos at the quantum level, while entropy increases, there are other disordered quantities decreasing, but those quantities are not observable in the macroscopic state. According to the research of the masters of the theory of circle quantum gravity, Abbe Ashitika and Lee Schmuling......"

Seeing this step, Ma Yiyi was completely confused.

In front of this, with her academic attributes, she can understand it anyway. Because after all, there is not much physical verification, but it looks a bit philosophical.

From this paragraph onwards, Gu Wan has not finished writing at all, only a few quotations, judging from the structure of the article, it seems that he intends to discuss many esoteric dry goods in the "Circle Quantum Gravity Theory", also known as "Quantum Geometry", and the experimental observations of predecessors as evidence.

Fortunately, Gu Play interrupted Ma Yiyi, who was immersed in confusion, in time, and asked her not to be discouraged: "Circle quantum gravity theory, or quantum geometry, is a cutting-edge sub-discipline in the underlying physical interpretation of the quantity of 'time'. ”

Ma Yiyi wiped her forehead and sighed: "Do you speak in the tone of 'not even a doctor'? ”

Ma Yiyi felt too frustrated.

How come every time you don't see Gu for a while, and then seize the opportunity to have an in-depth exchange, you will find that the gap between the two has become bigger again.

This feeling is too powerless and too hopeless.

Gu Yu patiently explained: "You just treat me as a picker, just play gimmicks." In fact, I don't necessarily understand much, and I don't expect readers to understand the experimental analysis and theoretical calculations that follow.

When I write, I think I am a book seller, as long as the people who eat melons think they can read the first 100,000 words, and read it as philosophy, the book will sell well. Anyway, when you use it to pretend to show off your knowledge, you will only talk about the parts that seem to be philosophical, and you can't brag about the later ones. ”

Ma Yiyi bit her lip and thought for a while, and asked, "I think your ambitions are so ambitious and your interests are so extensive, and they are no longer able to be explained by self-motivation and utilitarianism." Even if you're rich, making money is just a side hustle, right?"

Gu Play: "Of course, I'm not interested in money itself. Money is just a means for me to realize my ideals, I want to study the underlying natural laws of this world, how can it be possible without money, without a lot of money. ”

This sentence was deeply imprinted in Ma Yiyi's heart, and it also weakened her inferiority complex.

"I can't keep up with this realm, so I'll go back to reading and reviewing first. Ma Yiyi said, and the two returned to the library.

A day is spent in the pre-exam revision.

……

The next day, Sunday, January 17, is also Gu Wan's birthday, a typical "Magic Hero".

Since you are at least 18 years old, you can also register for a driver's license.

Early in the morning, Gu Yu packed up decently, and specially wore an Armani suit and windbreaker that he had just bought not long ago.

As a science and engineering man, Gu Yu actually doesn't like suits, and this set of clothes was bought last month.

Gu Wan was originally worried that when the scientific research project at hand was finally reported, some formal occasions would have to dress more seriously, so he bought it, but it was not used.

If you go out today, you may go to an elegant place to consume, so it's better to dress decently. Moreover, Gu Wan's appearance is relatively tender, and if he does not wear a suit, he is easy to be considered under the age of 18 when he goes to the DMV to sign up.

Although this kind of small misunderstanding can be solved by showing your ID card a few more times, it can still save as much trouble as possible.

The appointment with Ma Yiyi was half past eight, and the DMV wouldn't open too early, so he went to the school cafeteria for breakfast first.

I asked for a drawer of xiaolongbao, a bowl of chicken soup cat ears, and two small fresh meat mooncakes, and I was eating there, but the mobile phone rang, and it was my sister Li Shuangye calling.

"Happy birthday, I have a gift for you, are you surprised? Are you up, come down and get it!" As soon as the phone was connected, my sister's coquettish voice came over in shock, making Gu Play subconsciously take the phone away.

"I didn't expect you to remember my birthday, I ate in the cafeteria, did you eat?" Gu Yu swallowed the little fresh meat mooncake and muttered.

"Damn, I'm your own sister, why are you surprised? And why do you say 'also'? Are there other people who care about you more than me? Oh, it can't be that you have been hiding from me recently, and your relationship with Sister Yiyi has stolen away again, isn't it?" Li Shuangye said a lot, like a little magpie.

Gu Play: "No, she told me about her happy birthday in advance, but she didn't say that she wanted to prepare a gift." Besides, she just wanted to go with me to learn for a driver's license. ”

Li Shuangye: "Are you wooden? A girl took the initiative to say that she would wait until you reached the age of 18 before she could sign up for a driver's license with you? Do you think it's as simple as taking a driver's license? Where are you? Don't move, I'll come to you." I haven't had breakfast either, so I'll have to talk to you about it. ”

Gu Yu informed him that he was in the second canteen.

A few minutes later, my sister Li Shuangye didn't comb her hair, so she rushed over with her hair draped.

I bought a bowl of chicken soup bean brains, a pancake fruit, and sat next to Gu Wan:

"Tell me everything you got along with Sister Yiyi yesterday. Alas, Sister Kong has a stunt of flirting with girls, but it's a pity that she is a daughter, so she can only dial your wood and talk to herself. ”

"Did you brush your teeth?" Gu Yu watched his sister take a big bite of the pancake fruit, but his focus was on the other party's image.

"Of course my teeth are brushed!I'm just plain makeup, it doesn't mean sloppy!" Futaba pinched his small fist and gestured, and his cheeks bulged slightly, until he made a "cut~" complaining sound, and his cheeks were sunken again.

"Yesterday she came to ask me to sign up at the beginning, I was in the library at the time, and she was there, and then we ......" Gu played 1510 and told his sister about yesterday's experience.

After all, it's with his own sister, and he won't be embarrassed, of course, he can know everything in detail.

After listening to this, Li Shuangye said incredulously: "Sister Yiyi is really pitiful, it is obvious that she is already very interesting to you, and even a little bit of admiration." Why aren't you chasing her? What the hell are you hesitating about?"

Gu Play: "I'm just too busy to think about this all the time." ”

Li Shuangye: "Sister Yiyi doesn't look like the kind that is very clingy, she is very cool and a person, and she can't hold you back." ”

Gu Yu pondered for a moment and sighed: "I'm not afraid that she will be embarrassed before she reaches that point." Men chase women across the mountains, and women chase men across the veil. If it's abrupt, if not bad, it's embarrassing for at least a few months. ”

Li Shuangye: "You are really deaf, I am a bystander, I heard you relay the words of Sister Yiyi yesterday, and I also know that the time has come, people are waiting for you to speak, if you are a man, take the opportunity to take it today." ”

"Are you saying that she is hypocritical and must wait for a man to speak?" Gu Yu was stunned for a moment.

Li Shuangye stroked her forehead helplessly: "It's not hypocrisy! Her meaning is obvious, she thinks that you have made too fast progress, and she is a little weak-hearted." Yesterday I was gossiped about again in the library—

If I were you, when I heard other people in the library say that she was 'pretending to be cold, and meeting Gao Fu Shuai is not like that', I would have carried it righteously. It's not that you don't look down on her, what's wrong with taking the initiative?"

Gu Yu thought quietly for a few minutes, and felt that his sister was still right.

Gu You: "Then I'll find a way to take the initiative today, but if I confess, do I want to prepare a gift?" Or do you want to buy it when you go shopping?"

Li Shuangye thought for a while: "Buying now seems that you are not thoughtful and insincere, let me help you find a way...... There you go!"