Mai Dong reached out and pressed the button on the panel, and a window "PSYCHOLOGICAL TEST" popped up on the computer screen.

After a few seconds, the screen displays: Please complete the following questions.

The girl took a deep breath.

This is a test of mental and mental state, long-term boring claustrophobic life will affect people's mental state, so every crew member in the Mars landing mission must take a regular psychological test, in the past, this test was presided over by the team doctor Maxwell, but now there is only Mai Dong alone in the space station, so she can only take a self-assessment test.

Mental state is just as important as physical state, and in the first few Mars landing missions, the Earth side underestimated this problem - Romanenko once worked on the Mir space station for 450 days in a row, flew 5,000 times around the Earth, and his mental and mental state was normal. Therefore, the Earth side believes that the existing long-term mission experience of the space station is enough to deal with the Mars landing.

But then it turned out that the Earth space station and the Mars mission are two different things, and the psychological subversion of people by space voyages is beyond their imagination.

Orion 1 and 2 invariably had astronaut psychological problems during the first few missions, the most serious of which was the third flight of the Orion 1 spacecraft, on the way back, American payload specialist John Young suffered from depression, completely unable to work, and even tried to self-harm at one point, and was admitted to the hospital after returning to Earth.

In the words of John Young, "When you are completely out of Earth's orbit, you feel like you are sliding into a bottomless abyss." ”

Later missions to Mars began to make it mandatory for crew members to undergo regular psychological tests, raising mental health and physical health to the same level, and the team doctor must also have the qualifications of a psychiatrist.

At the same time, he also prefers people like Tang Yue in the selection of team members.

Mai Dong's psychological state has always been very stable, her curiosity about the deep space of the universe overcomes fear, this girl has grown up watching the stars since she was a child, her father bought her a 200mm reflecting astronomical telescope on Mai Dong's tenth birthday, the little girl watched the moon and Saturn on her balcony every night, she was obsessed with the vastness and breadth of the universe at a very young age, this yearning buried deep in her heart when she was a child, was the initial incentive for her to participate in the Mars program.

“Next，you will see an image，please follow the instructions.”

Mai Dong clicked the buttons on the screen and answered in turn.

The test has a total of hundreds of questions, involving various aspects, not just a psychological test, it also includes some mathematical and physical calculation questions, which examines the mental state of the occupants, thinking logic and even thinking agility.

"Mai Dong, we have stirred the poop evenly!" The voice of a manure digger sounded in the headphones, and it sounded really spoofing.

"What's next? Do you just bury the seeds in it? ”

"Nope." Mai Dong answered Tang Yue's question while operating the buttons on the panel, "This is the last step, and we still have a lot of processes to do before that...... The next thing we need to do is to let the fertilizer ferment. ”

"Fermentation?"

Tang Yue and the old cat were stunned.

"Do you know compost?" Mai Dong asked, "High-temperature composting." ”

"Yes."

"Under normal circumstances, human and animal manure will not be directly used as fertilizer, but will be treated to mix manure with straw, hay, and silt to ferment at high temperature, kill harmful parasite eggs and grass seeds, and let the manure be decomposed by bacteria and turn into humus." Mai Dong explained, "So Tang Yue, your manure also needs to be fermented and turned into fertilizer so that plants can absorb it better." ”

Tang Yue put a jar of manure on the side of the isotope temperature difference generator, RTG is continuously releasing heat, its surrounding temperature is the highest, can be kept above freezing, the most suitable for the growth and reproduction of microorganisms.

In fact, Tang Yue couldn't say how many bacteria were still in the stool in this jar, after dehydration, drying and cooling, the vacuum-packed feces were actually in a near-sterile environment - but you can't say it was clean, this principle was the same as the stool sterilized in a pressure cooker, although the microorganisms were killed, but no one wanted to let this thing get on their clothes.

Tang Yue found something to cover the jar, and then found a plastic sheet to wrap it layer by layer, covering it tightly, and those who didn't know thought he was hiding some kind of treasure.

If someone really came to steal this treasure, then he would definitely have a big surprise the moment he opened the jar.

"The normal compost fermentation process takes about half a month, Tang Yue, you can only control the situation on your side." "When the fertilizer is fermented and mature, it can be used to grow tomatoes." ”

The conditions on Mars are poor, and composting like on Earth is impractical, so everything can only be kept simple.

"How do I know if the fertilizer is ripe?"

"Eat, eat...... Oh no, you can look at the color and volume, if the color becomes black-brown, and the volume is reduced by more than a third compared to before, it means that the fermentation has reached a certain level. Mai Dong replied, "But the temperature over there is too low, and there is no oxygen, only anaerobic bacteria can grow, and this condition is not suitable for fermentation...... So I don't think you need to follow this method strictly, just wait a few days. ”

Tang Yue nodded.

"During the time when the first tank of fertilizer is fermenting, you can continue to make other fertilizers." "At the same time, you can start pre-treating the plant seeds. ”

"Understood!" Tang Yue got up and thanked him seriously, "Comrade Mai Dong, an agricultural expert, thank you for your guidance!" ”

Mai Dong smiled silently.

She finished the quiz and nudged the bulkhead slightly, drifting away from the control panel and looking at the screen from afar.

The mental and mental state test is over, and the test results are quickly given on the screen.

This is a complicated table, indicating various indicators and data, Mai Dong can't understand these professional characters, she directly pulls the page to the bottom.

Finally, there is a color column, the top layer is bright green, the bottom layer is dark red, the color gradient from top to bottom, this color column is the most intuitive response to the psychological state, the computer will draw all the data statistics into this picture, the closer the color is to the green, the healthier, the closer to the red, the more dangerous.

Every time Mai Dong took a test before, the results were in the bright green range, which shows that she has always been an optimistic person.

The girl's gaze swept over the color bar, and this time she couldn't find her pointer in the green zone.

Mai Dong slowly pulled down, and finally found that the pointer was stuck in the pale yellow area.

There is also a string of small red letters on the back.

"Dear Miss Mai Dong, your psychological and mental state is unstable and you have a tendency to be mildly depressed, please consult and counsel a psychologist in time to avoid further aggravation of the condition."