"We just talked about how to filter water using sand, charcoal, etc. Now, we'll talk about how to distill pure water from seawater."
Qi Xili set up his very simple experimental equipment on the table, used salted water as seawater, and demonstrated to everyone how to distill.
Since everyone present had attended university, this theory only needed to be briefly mentioned and did not require in-depth explanation. Therefore, fresh water was soon seen flowing out of the condenser.
"In practice, you don't need all those fancy beakers and condensers. You can collect a certain amount of fresh water by simply covering the boiling seawater with a plastic raincoat or a leaf. It's just not much, just enough to drink."
Qi Xili smiled and said, "Theory is theory, and practice is practice. We must be flexible and make use of what we have to get the most benefit at the lowest cost."
Seeing the trainees deep in thought, Qi Xili then explained how to find water in the desert. If water couldn't be found, how could one extract pure water from the air using the principle of water vapor condensing upon cooling?
"Today we'll talk about the three most common situations you'll encounter when surviving in the wild. Only by solving the problem of drinking water can life be extended for a longer period of time."
Of course, besides drinking water, there is also salt, which is essential for the human body. So, what I'm going to talk about next is how to extract and purify table salt in nature using primitive methods.
Upon hearing this, Shen Yanming and Bi Qiaoan were both stunned.
If extracting pure water was a basic survival rule, then extracting salt is a more advanced survival skill.
The two wondered if Qi Xili, being so capable, would teach them how to brew wine, vinegar, and soy sauce in the future.
In fact, the two were not wrong. Because the Qinghe Alliance was very worried about the future of Qinghua Kingdom, they held an emergency meeting in the capital.
The meeting's ultimate goal was to teach these survival and life skills to the guards as much as possible.
In this way, if an accident were to happen one day, someone would be able to pass on the flame of human civilization, so that the last survivors wouldn't have to start from scratch and repeat the path their ancestors had walked for generations.
However, they only taught them the most basic things. When it came to secret recipes, the guards didn't forcibly take them away. Instead, they suggested that the other party find more successors to spread the risk of the recipes being lost.
Shen Yanming and Bi Qiaoan were unaware of the stories behind these events, but they knew that the guards had gone to great lengths to ensure their survival.
Qi Xili shared his experiences and insights from his many years of missions abroad, hoping that they would not be helpless when facing a crisis.
After he explained the extraction methods for sea salt and land salt, he went on to talk about the purification of crude salt and the methods for making charcoal.
Until the bell rang, he called out "get out of class is over" with a hint of reluctance.
Then a group of people rushed towards the door, and judging from their demeanor, it seemed even more intense than yesterday.
Bi Qiaoan watched them being chased by monsters and couldn't help but wonder what was so great about squeezing in; waiting would only take two or three minutes.
It wasn't until she heard Yu Shui sigh that Bi Qiaoan seemed to realize something. It turned out they weren't being chased by anything, but rather afraid to face Qi Xili.
"Qiao An, can you understand? Can you remember? Can you put it into practice?" Yu Shui slammed her head on the table and asked the three soul-searching questions.
Bi Qiaoan really wanted to say that she understood, but seeing Yu Shui's expression, she didn't dare to undermine his confidence, so she vaguely said, "I've memorized most of it, but I haven't fully grasped the theory and experiments."
But I remember all of Captain Qi's crooked and unorthodox methods.
"Heh!" Bi Qiaoan heard a soft chuckle and realized that Qi Xili was still there, hiding behind the table, doing something.
Even if Bi Qiaoan had a big face, she would feel extremely embarrassed to be accused of using crooked methods in front of others.
She stood up, her face burning, and apologized to the other person: "I'm sorry, Captain Qi, I shouldn't have blurted it out."
I didn't mean to be sarcastic or belittle you by talking about unorthodox methods; on the contrary, I found those tips and tricks very useful and memorable.
Qi Xili didn't intend to argue with Bi Qiaoan, after all, what she said was true, there were indeed some strange and unorthodox methods.
He nodded and smiled, "You're right. It doesn't matter what method you use, as long as it's practical."
We don't know what the world will be like in the future, so it's always good to have more skills.
I hope we're all still alive when the new era arrives.
Bi Qiaoan nodded, "It definitely will!"
He thought to himself, "If even you all-powerful guardians can't survive, then ordinary citizens really shouldn't bother living."
After all, most people in peacetime only know how to sit in an office and use a computer; few are even proficient in farm work, let alone these skills that can turn the tide in dire situations.
Qi Xili nodded and left without saying anything.
Seeing that they were the only ones left in the classroom, Shen Yanming and Bi Qiaoan checked the windows one last time, then turned off the lights and locked the door.
This time, the lock on the door was open, so after Shen Yanming went out, he simply locked it again.
Then the group chatted and laughed as they returned to their dormitory.
Seeing that Yu Shui was still out of sorts, Shen Yanming comforted her: "Don't focus on the theory. The purpose of the training is to help you master more survival skills, so just learn how to use them."
"Then, what about the assessment?" Yu Shui hesitated.
"Since the evening training is for practical purposes, the assessment will definitely be biased towards the opponent."
Shen Yanming stopped and looked at Yu Shui seriously, saying, "Furthermore, you need to distinguish between primary and secondary matters."
Joining the guard unit doesn't mean you have to go back to college.
Those profound theoretical concepts are merely icing on the cake; what you need to do is see through the phenomena to the essence.
Yu Shui said he had learned his lesson, and Zhu Shiliang and the others also suddenly realized what had happened. If Shen Yanming hadn't reminded them, they might have gone astray as well.
Their thinking is still stuck in peacetime training and assessment, assuming that the other party will definitely ponder the theoretical knowledge repeatedly, intending to go back and memorize it in order to prepare for the exam.
It wasn't until they were reminded that they realized the world had changed, and they were no longer students. Survival was their primary goal, and theoretical knowledge was only needed to be understood superficially.
At the fork in the road, Shen Yanming and Bi Qiaoan watched as the somewhat dejected figures of the group walked away into the distance.
Then, Bi Qiaoan looked at Shen Yanming and asked angrily, "Why didn't you remind me that Captain Qi was still upstairs when we were in the classroom?"
Shen Yanming chuckled and poked her cheek. "Back then, how could I have known you would say something so astonishing?"
Okay, it seems like I'm taking it out on them a bit.
Since that's the case, then let's forgive them generously.
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