"Ding, ding, ding."

The familiar mechanical sound entered Shu Han's ears, he opened his eyes almost reflexively, this is his home, the mobile phone is making an alarm sound, looking out the window is already a sunny day, the sound of cicadas coming from the window, a vibrant, all things are born of the scene, so that Shu Han burst into tears.

"I'm back again."

Shu Han muttered, but this time compared to the last time, Shu Han's mood fluctuations are relatively not so big, on the one hand, he is used to it, and on the other hand, he knows that he still has a great possibility to go back, so thinking about it, naturally there is nothing to be excited about.

He first took out his phone to check today's date, August 5, 2020, Sunday, I think about it, go to cram school after ten o'clock and end it at four o'clock in the evening, well, record it.

Working in the mine for a long time, he has a little ambiguity about his identity and courses in this era, and now it seems that he can only record it through his mobile phone to avoid forgetting some important things, and after recording all this, Shu Han glanced at the time, seven o'clock in the morning, he still has time.

He immediately sat down in front of his computer and began to search for articles about ancient mining techniques and the like to read.

He clearly understands that there is a great possibility that he will return to that damn place again, so he must be ready, what he needs after he goes back, for example, the mining skills of the ancient mines, the reason why he chose the ancient skills, is because the pit, compared with modern mining, is simply incomparable, even if there are some skills, I am afraid it is not applicable, so he chose the historical documents and reference documents of ancient mining to read.

But these documents and content themselves are the unpopular of the unpopular, and general portals and search engines, including Baidu Encyclopedia, the trump card of Chinese search websites, do not have much knowledge of this kind at all, so that Shu Han can read and study carefully, Shu Han couldn't help but curse angrily, but the movements in his hands did not dare to stop.

"Forget it, you can only go to CNKI to look for it."

HowNet, China's largest paper library website, maybe there will be some records about the mining skills of ancient miners, thinking of this, Shu Han opened HowNet, the reason why he will know this website, is because his father is a university teacher, in his daily work, will come into contact with this website, Shu Han naturally knows this website, but he basically does not open it.

After all, he is just a high school student, and it is not yet time to apply this website, but at this time, it is obviously the time to use this website, open the knowledge network page, look at the search page in front of him, Shu Han thought about it, tapped the keyboard, and typed the words "ancient mining", but after a search, it showed that there were no relevant papers, Shu Han frowned, it seems that this knowledge is indeed very unpopular, and there are no people who study it.

Shu Han tried several ways later, but no relevant papers appeared on the search engine, the angry Shu Han pushed the keyboard, and the whole person lay down on the chair, making a creaking sound, looking up at the ceiling, he was really helpless, and faintly wanted to give up, but when he thought of those brothers in his dormitory, they finally had a glimmer of hope, could it be that he just ignored it?

And what happens when I go back? Although Shi Ping and Zhang Song are right, but if there is no technical support, maybe it is very likely to die in the end, based on Shi Ping and Zhang Song's statement, Wang Ji doesn't care about the life or death of the people in their dormitory, maybe he has some scruples about himself, but what about other people?

As his captain, killing a few people is not a problem at all, will he kill chickens to show monkeys? Thinking of this, the idea of giving up in Shu Han's heart immediately disappeared without a trace, no matter what, he had to do his best to try it, he quickly cheered up, and typed all the related words about mining that could be thought of in his mind.

Finally, the emperor lived up to his wishes, and when he searched for "ancient science and technology", there were finally more than a dozen related papers, including a table of contents for three articles, involving research on the archaeology of ancient underground drilling relics, Shu Han finally breathed a sigh of relief, but clicked on it to take a look, paid to download, Shu Han almost didn't mention it in one breath.

This is really knowledge equals money, but at this time, it is impossible not to download, if you go to the library to find it, who knows if there is one, and how much time it will take, there is no way to calculate, after thinking about it, Shu Han hurriedly walked out of his room, Xia Yang was swiping his mobile phone in the living room, eating, Shu Han walked over, and said: "Dad, lend me your CNKI account." “

"HowNet account? What are you doing? Xia Yang's puzzle was written on his face.

"I want to download a few papers, and I've been interested in some fields lately, and I want to read them." Shu Han casually found a reason and said, staying in the last days for so long, he didn't learn much else, the ability to lie can be described as a thousand miles of improvement, he is still a minor, he doesn't have his own credit card, online payment, it's not feasible at all, as for using the WeChat balance accumulated on weekdays, he really doesn't have this money.

Although their family is not poor, they are very strict with their children's discipline, and they have almost no pocket money, so even if they pay for these papers, Shu Han really can't afford to pay it, so he can only ask his father to buy it with an account.

But this idea, for the time being, can only be kept in my heart, I plan to slowly find a way in the future, to see if I can make some money, so as to avoid the time when I want to use it in the future, there is no chance, Xia Yang heard Shu Han's explanation on the side, but he didn't doubt it much, but he was very pleased in his heart, the child was willing to contact knowledge, which was of course not blocked by his father, and he immediately told Shu Han his account.

After Shu Han took his mobile phone and wrote down the account password, he hurriedly rushed back to his room, used Xia Yang's account to buy those papers on underground mines, and then quickly flipped through them, most of them were some useless knowledge, pure theory, and starting from archaeology, to demonstrate the development of civilization in the region at that time, as well as the use of iron tools, these knowledge were useless for Shu Han, and what he needed most now was practical and applicable.

Flipping through the pages, Shu Han searched every keyword as much as possible to ensure that nothing was missed, and there were indeed a lot of introductions to the skills, but many of them have been used in the mine, and some of them are not available to Shu Han today.

They often have to use large tools to complete, Shu Han is just a dormitory leader, not a supervisor, where to find those large tools to improve efficiency, what he wants, can only be some small skills, but can improve work efficiency on a large scale, which is naturally very difficult to find.

Especially these papers are not novels, when I first read them, I was still able to concentrate, but when half an hour passed, and there were no clues, Shu Han unconsciously began to yawn, and his eyes were also red.

But at this time, thinking of his future in the apocalypse, thinking of those roommates, and Wang Ji's hateful bastard, he persevered, and finally found an introduction to the advanced techniques of ancient mining in a paper, and he quickly took out that page of the paper separately to view.

"I see, such a simple way, why didn't I think of it?" Shu Han said excitedly, one of the methods recorded in this paper is the method that is not used in the mine today, but can improve efficiency on a large scale, he hurriedly wrote down this method, wrote it down on paper, and prepared to memorize it several times in the evening to ensure that when he goes to the end of the world, he can not forget it.

Waiting for the work on the pen to stop, Shu Han felt a little annoyed in his heart, such a simple method actually cost more than 100 yuan, although it was not his own money, but Shu Han was also a little distressed, and at the same time felt that he was really stupid, such a simple method, why didn't he think of it?

However, Shu Han is undoubtedly critical of himself, in the course of human history, there are many things that can be easily discovered in the eyes of later generations, but people at that time could not find the laws, such as the movement of the sun, whether the earth is round or square, these problems are not problems in modern times, but in ancient times, because of the limitations of thinking, he will summarize some conclusions that are ridiculous in the eyes of today's people, and think that they are the truth.

Shu Han himself is a person, naturally has this kind of limitations, saw the paper and suddenly realized, I think this method is so simple, but as everyone knows, such a simple method is the human beings spent thousands of years to summarize and study, but for these thoughts, Shu Han naturally will not think about it, after completing his work, Shu Han no longer looks at the computer, walks to the windowsill, looks at the green outside the window, and let his eyes recover a little.

"With this information, the problem of two shifts should be solved." Shu Han's mood was much lighter at this time, and the expectations of his roommates were like a heavy burden, pressing on his shoulders, making him breathless, and finally found a good way at this moment, and he was no longer so depressed.

After the spirit was almost recovered, Shu Han walked out of the house and started to eat breakfast, Xia Yang was already dressed, dressed in a middle-aged decent suit, holding a suitcase in his hand, seeing this, Shu Han asked, "Dad, are you going to go far away?" ”

"Well, in Kyoto, an old colleague of mine has encountered a little problem in the experiment, and he wants me to help in the past, and he will be away for about a month, and during this time, please help my mother and deal with housework." Xia Yang said with a smile, Shu Han was not surprised, his father, as a teacher in the university, was very busy, and he was not at home for most of the year, which was a common thing.

"Oh, Dad, be careful on the road, and when you get there, call Mom." Shu Han said, Xia Yang nodded, put on his shoes and left, after Shu Han ate almost, he suddenly thought that he downloaded the paper from Zhiwang, and his father was afraid that he would check it, if he knew that I was looking at archaeology and mining information, although there was no problem, Shu Han always felt that this involved his own secrets, and he was obviously not able to tell others now.

When he came back this time, he actually thought about telling his parents about it, but after thinking about it, he finally decided not to talk about it for the time being, for three reasons, the first one is too metaphysical, and it is very likely that he will be treated as a mental illness and then sent to a special hospital, then his life in this life may be over.

The second reason is that he doesn't want his parents to worry, if this matter is known to his parents, they are still willing to believe that they will inevitably worry about it, and Shu Han is most afraid of troublesome others, he doesn't want his parents to have too much and useless worries about his life, so he chooses to hide it.

As for the third reason, it is useless to say it, because until now, the reason why he has traveled back and forth between the two worlds, he doesn't know, why the world has become like this, and he doesn't know, for Shu Han, the connection between the two worlds now, the reasons for the changes, and the problems on his own, he doesn't know any of them, and he doesn't even have information, in this case, what is the use of telling them that he can travel back and forth between the world after hundreds of years?

Maybe he will be regarded as a madman, or enter the research institute to be studied by scientists, he is afraid of all this, so he chooses to conceal it, and it is exactly like this, thinking that his father may go to check the papers he downloaded, he felt scared for no reason, he hurriedly walked back to his room, cleared all the download history and past search records, and then exited Xia Yang's login, which is reassuring.

took out his mobile phone and glanced at the time, it was almost close to nine twenty o'clock, and it was almost time for him to leave for cram school, so he took off his pajamas, changed into a light blue shirt, and picked up his backpack, Shu Han began to walk in the direction of the bus.

The cram school he signed up for is still far away from the door of his home, and now that there is plenty of time, Shu Han doesn't plan to ride a bicycle, he is so tired, he almost doesn't rest after getting up, and he keeps reading papers, and the knowledge involved in those papers is really esoteric for him, so he urgently needs some time to rest now, and doing the bus is undoubtedly a good choice.

The urban transportation system of Hai'an City is very developed, waiting at the bus station for less than five minutes, a bus going to the direction of the cram school stopped in front of the stop sign, Shu Han swiped the card to pay the money, quickly found a place to sit down, while looking at the scenery outside the window, while resting.

At this time, the sound of 'zizi' came from the mobile phone, Shu Han took the mobile phone in front of him, and saw that Su Yu was sending him a text message, all of which were colored words, Shu Han was stunned after reading it, although Su Yu was a playboy, but he would not start sending jokes in the morning.

Then I remembered that in this time and space, the day before, I seemed to have gone out to eat with Su Yu, Peng Lili and Peng Nanzhu, and that night, Su Yu also went to open a room with Peng Lili and handed over Peng Nan to himself, thinking of this, Shu Han couldn't help but put his eyes on Xinjia's friend, Peng Nan's name was the first.

But after taking a look, Shu Han found that he had no desire to contact her at all, anyway, he might have to go back to that damn place at night, for himself, a long time ago, for people in this time and space, it was just one night, and it was not certain whether he could survive or not, thinking of this, Shu Han didn't say that he was in love, but he didn't even have much motivation to study.

"Anyway, since I promised my parents, I must fulfill my promise, the exam results must not fall, besides, the most lacking in the end of the world is modern knowledge, if you can't get into a good university, you won't be able to learn the knowledge you need most, in order to make yourself more valuable in the end, you must also work hard, Shu Han, come on."

Thinking of these, Shu Han also has a greater sense of urgency for learning, in the past studying was to live up to the expectations of his parents, but now, academic performance will be closely related to his own fate, and may even affect his life and death, when such an urgency is placed in front of him, Shu Han has to work harder to study.