Taking off the game helmet, Lin Ling moved his stiff neck a few times and sat up from the bed.

The early morning sun shone into the small room and shone on him. He subconsciously covered his eyelids and looked at the bright sky outside the window.

It's also a sunny day.

Lin Ling got up, washed briefly, sat down in front of the computer, and checked his email on the Internet while eating the instant nutritious breakfast that the hospital had configured for his condition.

The communication between Earth and Mars is very expensive, and if there is nothing urgent, Lin Ling and his parents communicate via email.

In the mailbox, as usual, lies a daily greeting letter from my mother, who is far away on Mars.

Lin Ling opened the email, glanced at it, wrote some words of comfort to his parents according to his past memories, and concealed his entry into "Eternity", and at the same time told his parents not to work too hard.

After writing it, Lin Ling found that he had returned the words his mother had used to tell him to them intact. He shook his head with a smirk and sent out the letter.

Next, it's time to get out the door.

Lin Ling picked up a backpack and walked out of the house and took the morning bus to the university town on the outskirts of the city. He remembered that in a few days, he would receive an admission letter from the Future University of Science and Technology, and hoped that he would go to the suburban university town on September 15 to report and go through the relevant procedures such as admission.

Since the Lin family has been engaged in the arduous development of Mars for generations, Lin Ling, as a direct descendant, can enjoy certain preferential policies in terms of medical care, education, and transportation, even if his body can no longer afford this kind of work, he does not need to pay college tuition. But he still had to pay for books and fees.

The cost of college books is quite high, and the price of some professional books is enough for Lin Ling to eat a light and tasteless nutritious breakfast for a month. The reason why he went to the university town today was to try his luck and see if he could find some cheap old books in good condition. In this way, he does not have to buy new textbooks and saves money.

The suburban university town is crowded with five or six universities, most of which are specialized colleges set up by the government to better develop Mars, and it is rumored that these universities will be merged into a comprehensive college in the future. However, Lin Ling did not see the shadow of the merger of colleges and universities until ten years later.

However, the various flea markets outside the university town have already been merged.

Lin Ling got off the bus and saw the sign of the flea market far away. When he entered the flea market, he found that most of the people who were willing to come out in the morning to practice their stalls were some hawkers who specialized in second-hand book brokers, and there were few serious college students.

The shelves of second-hand bookstores are filled with textbooks of various subjects.

Although the bookstore has also been sorted out according to the category of textbooks, after Lin Ling took a few textbooks and read them, he found that the method of summarizing used bookstores is to arrange them according to the selling price of the textbooks.

"Professional books are discounted, and basic disciplines are discounted." The bookstore owner saw Lin Ling flipping through old books, and habitually reminded him of the price.

Lin Ling flipped a copy of "Martian Geology" to the end, and looked at the price, 200, and 80 ...... for four discounts He touched his money bag, and the money on his body should add up to more than 400, and he would have to go to the bank to withdraw any more.

"Didn't you sell it by the pound?" Lin Ling put the almost brand new "Geology of Mars" back on the bookshelf, he couldn't afford to buy a good condition, he bought a general store with average quality, right?

"That pile, 5 cents a pound." The bookstore owner was probably used to seeing poor students, but he wasn't very angry. He pointed to a few cardboard boxes piled up in the corner and said, "Sell from ten catties, you can pick if you like it, and I will send the rest to the waste recycling station in the afternoon." ”

Lin Ling opened the cardboard box, and a strong musty smell suddenly wafted out of the box, choking him half to death. He coughed a few times, glanced at the gloating bookstore owner, and rolled his head down.

Most of the notebooks stored in the cardboard boxes were paper, yellowed in color and rough to the touch, apparently made from recycled paper.

The original owner of these notebooks should be poor students who can't afford to use electronic notebooks, Lin Ling picked up a notebook and opened it, and saw a handwritten draft of the paper "Breeding in a Low Gravity Environment One or Two", which talks about the relevant matters to be paid attention to in Mars breeding, from Lin Ling's point of view, I feel that the academic foundation of this article is very solid, unlike ordinary college students who can write it. He turned to the first page and saw a name: Zheng Guofan.

"It's Zheng Guofan's notebook." Lin Ling muttered to himself as he looked at the worn-out notebook in his hand. He didn't know Zheng Guofan, and there are not many people who know the name Zheng Guofan now. But as a person who has come over, Lin Lingke knows very well what Zheng Guofan has achieved in the future.

Young Scientist, Advanced Science and Technology Worker, Spark Science and Technology Award, Director of Natural Science Association...... It has been said that Cheng Guofan's future achievements in space farming will fill a showroom.

The most important thing is that the farm that Lin Ling's parents opened up on Mars was able to overcome the breeding problem by relying on the book "Mars Breeding Guide" written by Zheng Guofan! He had thought more than once that if his parents had seen Zheng Guofan's doctoral dissertation earlier, and if his parents' Mars farm had been on the right track earlier, the future of the whole family might have become completely different, right?

Lin Ling rummaged through the cardboard box, which was full of Zheng Guofan's notes. He picked up the cardboard box and placed it on the scale next to the bookstore owner's desk, and expertly weighed and calculated.

"Exactly ten pounds." Lin Ling took out five coins and put them on the counter, picked up the cardboard box and ran out of the bookstore, eager to go home and scan and sort it out.

"Could it be that gold is hidden in that cardboard box? No, I've checked it inside and out several times. The bookstore owner swept the coins into the drawer and looked at Lin Ling's back in a daze. Before he could retract his gaze, he saw a sweaty young man turn the corner and rush into the used bookstore, asking anxiously.

"Boss, did someone send a cardboard box from Building 3 of the Future University of Science and Technology yesterday?"

"It seems like that." The bookstore owner turned over the account book, and it would be troublesome to collect used books in a university town, and some students would always put important materials in the old books and sell them together, and when they found out that the books had already changed hands, fortunately they were smart enough to make an account of their daily entry and exit.

"Where's the stuff?" The young man looked around, trying to find the familiar stack of notebooks in the store.

"Just bought." The bookstore owner raised his head and looked at the young man who was furious after hearing the words with an expressionless face, and a glimmer of disdain flashed in his bloated eyelids. How can a guy with such a rough personality be able to achieve something in the academic field?