Tang Yue opened the door of the garage, because the Martian stray dog had been driven away by the old cat, and now the garage was empty, just enough to be used as a workshop, Tang Yue put the sink in his arms on the floor, and then turned around and went back to hug the RTG.

The conditions in Kunlun Station are very limited, Tang Yue can only do what he can do, he sits on the floor, with an isotope temperature difference generator in front of him, and then covers himself with a large thermal insulation blanket, using himself as a fulcrum to form a simple tent, the purpose of this is to keep warm, the heat generated by RTG is gathered in a small space under the blanket, and it is not so easy to lose.

The sink, compressed biscuits, plates, cups, measuring cylinders, pestles, and gauze were all placed on the floor in front of Tang Yue, because the light in the garage was not good, so Tang Yue also turned on the headlamp of Mingguang armor.

Tang Yue brought six compressed biscuits, which could provide him with 180 milligrams of vitamin C under ideal conditions, because the number of cold-made biscuits in the station was not enough to support the tomato fruit, so Tang Yue had to make a plan and reasonably distribute the vitamin C intake in the next two months.

Tang Yue plans to supplement two hundred milligrams of vitamin C every day in the next week, which will consume about forty-seven biscuits, accounting for half of the total, but this is also a helpless move, Tang Yue's physical condition is not optimistic, he has begun to have serious mouth ulcers, and if he doesn't quickly supplement vitamins, he can't even eat.

Tang Yue unpacked the compressed biscuits - it took him a lot of effort, and it was inconvenient to wear the gloves of Mingguang armor to do fine work.

"Where did the ghost cat go?" Tang Yue threw the hard biscuits into the empty sink, "Where did you go...... Why haven't you come back yet? ”

Tang Yue remembered that King Wu Yue of the Tang Dynasty sent a letter to his wife who went home to visit relatives, and the letter said that "the flowers bloom on the Mo, and they can return slowly". If Tang Yue can write a letter to the old cat, he will definitely be full of affection, like Wu Wang Qian Biao, with a few words, touching people's hearts.

He was going to write: "***! Old***! ”

Although there are only six asterisks, the strong emotions contained in it are ready to come out and rush to the face.

"Tang Yue, I've seen a full five thousand satellite photos."

"It's a great breakthrough, congratulations on completing one-twentieth of the total, have you found anything?" Tang Yue asked.

"Uh-huh."

Tang Yue stacked six compressed biscuits in the sink, and then he wanted to crush the biscuits, and then soak them in water, to be honest, this is ruining the food, these biscuits were already unpalatable when they were original, and if they twisted it again, soaked it, the taste and texture were unimaginable.

Tang Yue broke the biscuits with great force, then crushed them little by little, and the pieces were followed on a plate.

He broke all six compressed biscuits into pieces, then crushed them into powder as much as he could, using a pestle, and carefully poured them into a large number of cones...... Tang Yue could only pour a part of the compressed biscuits into the graduated cylinder, because the volume of the graduated cylinder was limited, and there was still enough space to add fresh water, so Tang Yue decided to extract vitamin C in several parts.

"I said Tang Yue, will the disappearance of Mr. Cat have anything to do with the disappearance of the earth?"

"What do you mean?"

"Do you think, the earth disappeared overnight, and Mr. Cat disappeared overnight, could they have disappeared for the same reason?" Mai Dong said.

"I've been talking to the old cat about the cause of the Earth's disappearance for a long time, and I haven't been able to come to any conclusions." Tang Yue shook his head and lightly mashed the biscuits, "It told me that so far, there is nothing within the scope of human cognition that can make the earth disappear without a trace, and in the end we have to blame it on some unknown natural phenomenon, or an advanced alien civilization...... Do you mean the old cat fell into a wormhole, or was it captured by aliens? ”

Mai Dong pondered, it is obvious that these two speculations are not reliable, they are completely based on utopian dreams, and do not have any reference value.

"Don't be cranky, the cat that saw the ghost is probably overturned in some gutter." Tang Yue picked up the graduated cylinder, shook it vigorously, and approached it with wide eyes to examine it carefully, confirming that there were no impurities in it.

Tang Yue's actions were still quite cautious, he cleaned the garage to prevent any foreign objects from falling into the graduated cylinder or water cup, anything that enters the mouth on Kunlun Station needs to be strictly disinfected, now Tang Yue does not have this condition, he can only try to keep it clean.

Tang Yue unscrewed the lid of the water cup and poured the water into the graduated cylinder.

With the sound of dripping water, the biscuit powder is mixed with fresh water into an earthy yellow paste, which looks a bit like mud, the starch in the compressed biscuit is gradually dissolved in the water, and some impurity particles that are insoluble in water sink and float up and down in the solution, Tang Yue gently shakes the graduated cylinder to mix the solid and liquid evenly, and the liquid surface is foamy.

He wants to extract the vitamin C in the biscuits, the only solvent that can be used is water, as long as the biscuits are fully soaked in water, the vitamin C contained in the biscuit will be dissolved in the water, and finally filtered, the vitamin C will be separated from the biscuit with the solvent.

If this method is implemented on Earth, the vitamin C will be oxidized by the air during the dissolution and stirring stage, and it is completely impossible to extract it successfully, but there is no such concern on Mars, where the atmosphere is thin and does not contain oxygen, and the vitamin C can be preserved intact.

"To be honest, I really thought about aliens before."

"I've thought about it too, but I've thought about it a lot, and I've also thought about taking the Tsinghua University tweed, most of which are wishful thinking." Tang Yue shook his head, "If it's really the aliens who captured the old cat, then we will also search, and the old cat may have flown out of the solar system at this time." ”

"Are aliens wishful thinking?" Mai Dong asked.

"When you were a kid and failed your school exams, would you pray that aliens would help you tamper with your scores?"

"I've never failed an exam."

Tang Yue was stunned, "Okay, when you break up with your ex-boyfriend, will you hope that an alien will come and shoot that scumbag in the head?" ”

"I've never had a boyfriend either."

Tang Yue choked again, "Then if you encounter any unfortunate things, such as your kittens and puppies are lost, do you think that aliens have taken them away?" ”

"No, it won't."

"That's not it." Tang Yue spread his hands, "Since you don't think that aliens will take away your dog, then why do you think that aliens will take away our cat?" What's more, this is still a stupid cat with a cheap mouth, and no one wants to give it away for nothing...... Could it be that just because you're on Mars, you're more likely to encounter alien creatures? If I were an alien, I would definitely be more interested in Earth. ”

"So the Earth is gone?" Mai Dong asked coldly.

Tang Yue was taken aback, the girl's question shocked him.

"That's it, I'm going to filter the vitamin solution next, don't interfere with my work."

He placed the graduated cylinder on the floor and let it stand, the cloudy suspension began to separate, and the water-insoluble solids slowly settled down, and the boundary between the upper layer and the precipitation was clear.

He carefully tilted the graduated cylinder and poured all the earthy yellow clear liquid into the water glass.

Then there was a mud-like biscuit paste left in the graduated cylinder, and at this time medical gauze came in handy, Tang Yue covered the mouth of the graduated cylinder with multiple layers of gauze to make a simple filtration device, and then inverted the graduated cylinder to leach out the remaining solution.

This process is very slow, it takes about an hour for all the free water to drip down, Tang Yue has no clamps, all by hand, he has to maintain a posture for a long time, so his back hurts, and he has to pause to rest and move his hands and feet.

When gravity strips away most of the free water, a large cloud of wet mud is left in the cylinder...... Tang Yue poured the mud on the gauze, wrapped it in gauze, and then wrapped it in a waterproof plastic film on the outside, then held it with both hands, squeezed it hard, and the last water flowed into the cup along the gap in the plastic film.

Tang Yue didn't want to waste the slightest fresh water, so he tried his best to squeeze out the water in the biscuit paste and knead it into various shapes like kneading dough.

The final result is a ball of bizarre flatbread, and three hundred milliliters of brown-yellow solution, as far as the result is concerned, Tang Yue's efficiency is still quite high, he poured more than three hundred milliliters of fresh water, filtered out three hundred milliliters of vitamin C solution, there is not much waste, of course, this solution must not only contain vitamin C, but also other water-soluble ingredients in compressed biscuits.

Tang Yue let out a sigh of relief, the initial trial production was a complete success, if it weren't for the fact that he couldn't open the mask outdoors, he still wanted to taste what this muddy water tasted like immediately.

There were still quite a few biscuits in the sink, and Tang Yue cheered up, he had to extract all the vitamin C before it got dark.

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(Author's gossip:

I had nothing to do to look through the bookshelf, and accidentally found a few old books, and saw Liu Wenyang's "One Day Prisoner", I couldn't help but revisit it, with Liu Gongzi's talent, if he hadn't died young, he was now afraid that he could stand side by side with Da Liu in the science fiction literary world.

There is also Heinlein's "Puppet Master", a classic alien invasion theme, I want to write about Star Wars or something, tsk. ）