The wild boar kept sniffing at his feet. After sniffing for a long time, it almost hit him. Bifang finally reacted and dragged the stone away from the place.
After the person blocking the road left, the wild boar immediately buried its head in the soil, arched its long nose a few times, and released a nut covered in soil from the soil.
Then a cave was exposed, and a big black rat suddenly jumped out of the cave, but before it could escape from the cave entrance, it was bitten by the wild boar, crushing the bones together and eating it.
The audience was shocked. Bi Fang had lived here for more than ten days, but he didn't even notice that there was a mouse hole nearby?
"I almost forgot, the sense of smell of wild boars is more sensitive than that of dogs, and many truffle hunters rely on pigs' sense of smell to find truffles," Bi Fang said happily.
He had lived here for more than ten days, and he had never noticed a mouse hole under the rock where he often sat.
The water monitor lizard didn't respond either. It's because he eats and fish every day and doesn't care about mice anymore?
[Piggy is so strong that it is useless for military purposes? 】
[Who said there isn’t one? It’s been there for a long time, in the cooking class]
[Cooking Ban, are you going to kill me and inherit my property? 】
【Eat and drink enough to have strength, pigs make great contributions.】
"Because pigs are smarter than dogs, they are more prone to complex emotions, such as fear and withdrawal, and their obedience is much worse. In addition, pigs have poor eyesight and poor agility, so they cannot replace dogs.
.”
When the other three wild boars saw that their companions had gained something, they all hunched together, stuck out their curled buttocks, dug up the entire soil layer, and ate all the white mice that had not yet grown hair inside.
Bi Fang raised his head and saw that the time was almost up, he said with regret.
"Before I came, a staff member told me that there are many wild monkeys and wild boars in the ravine rainforest, but I have traveled so many places that I have seen white-legged bison and wild boars, but I have not been lucky enough to encounter wild monkeys. I guess they are
My appearance problem."
This remark made the audience amused and laughed.
The last moments slowly fell towards the end in the chat. The wild boar had left, the drone slowly took off, and the wind blew through the forest with thousands of hectares of trees. From a distance, it looked like a sea.
The pale red sea.
The treetops form waves, layer upon layer,
Countless returning birds turned into black spots and flew into the distance or into the jungle. Only one black spot grew bigger and bigger, causing a roaring sound.
Everything is like returning to the starting point of the story.
"You think, why do humans need iron?"
Bi Fang suddenly asked.
Of course it’s because iron is so easy to use, and the audience responded without thinking.
"Yes, iron is very useful."
Bi Fang raised the polished dagger in his hand. Its original dark appearance had long since disappeared. It was completely silvery white and glowed with a dazzling bright orange light under the setting sun.
Hard, sharp, and tough, who can say it's not easy to use?
"Bronze is an alloy of copper and tin. It is also the first widely used metal. Its history can even be traced back to prehistoric times. Iron, which requires high-temperature smelting, developed later, but iron is harder, wear-resistant, and easy to obtain.
, so it quickly replaced the status of bronze."
"It can be found everywhere from buildings, transportation, tools, and weapons. If you want to understand a certain metal and its importance to civilization, then it must be iron."
"Maleable iron is too soft, even softer than bronze, and its use is limited. When fighting, you definitely don't want your sword to be too soft. Only at this time does mankind need steel."
"Over the past few centuries, blacksmiths have sought various ways to strengthen wrought iron. Without the guidance of chemical science, they could only do it through trial and error over and over again.
Eventually they discovered, oh, it turns out that heating wrought iron on charcoal will harden the surface of the wrought iron, making it very suitable as a cutting surface.
So I speculated that some kind of substance should have entered the wrought iron and strengthened it. This was the carburizing method.
Gradually, they also discovered a process called 'quenching', which involves immersing heated iron in oil or water and cooling it quickly, making it harder than slowly cooling iron.
But it is hard, and it is too brittle. If the two come into contact, it will easily break.
After groping and groping, they found that this shortcoming could be improved through another technique called 'tempering', which is to reheat the iron to a lower temperature and let it cool slowly to 'relax' the iron. Reducing some of the hardness is toughness.”
The dagger polished with rough stone was covered with scratches, blurring Bifang's cheek.
The roar in the sky was getting closer and closer, and Bi Fang's speaking speed was getting faster and faster, making the audience feel reluctant to leave.
Gu Si
The time has come to say goodbye.
"Although the ancients used experience to summarize technology without understanding the principles, and every improvement is brought about by thousands of accidents or trials and errors, but we are well educated and understand many basic principles, but we cannot easily to restore these technologies."
"Today, steel smelting has become a complete set of closely connected industries."
“Iron ore and coal mined around the world are transported to large steel plants, where the ground iron ore is sintered into pellets and the coal is carbonized into coke – which is then stacked in layers into blast furnaces that are hundreds of meters high.”
"The treated coke can even be burned to a high temperature of over 1500°. The iron ore is directly converted into molten iron. It is then poured into a converter and pure oxygen is blown in to allow impurities to oxidize and escape. Different elements are added as needed to produce molten steel with precise composition. .”
"Finally, it is injected into the mold and cooled, and various shapes are pressed at a temperature of 1100°C, and then distributed to every field of modern industry, ultimately supporting the entire modern civilization."
"How to develop the most precise formula and make steel with the best performance is the most hardcore competition in modern civilization. Compared with this, the small piece of steel I made in the wilderness is not worth mentioning. "
Bi Fang laughed at himself.
The audience immediately became anxious.
【How could it be possible? Absolutely awesome!】
[Even if I know the whole process, I can only look up]
[I don’t care, I don’t care, Fang Shen is number one in the world!]
Bifang Mena: "I know you like me very much, but if you are really interested in ironmaking, then study hard and develop more useful materials in the future to contribute to the construction of the motherland. Then you will have surpassed me." "
The helicopter spotted Bi Fang in the dense forest and quickly lowered the rope ladder.
Bi Fang grabbed it and climbed quickly. When he was halfway up, he made a gesture to the driver and slowly pulled up.
"The density of dangers in the rainforest is very high. During the twenty-one days of survival, we saw many beautiful and dangerous creatures that we have never seen before, from white-limbed bison to Burmese pythons, from water monitors to cobras, Before I came here, I never thought that I would meet so many first- and second-year students from the country."
The audience thought of cobras, giant squirrels, bison, pythons, and water monitor lizards as companions, and couldn't help but nod.
"I also built a shelter with Leonardo and made various tools. The most important thing is that I opened a furnace to smelt iron and obtained a steel dagger!"
Bi Fang held high the only harvest he had brought out of the rainforest.
If they hadn't witnessed it with their own eyes, no one would believe that this knife was crafted bit by bit in the rainforest.
I came with a grass skirt and left with a grass skirt and a steel knife.
"Now, I am leaving. I sincerely hope that the skills and stories I have shown can bring you gain and happiness."
"Then today's live broadcast ends here, see you next time!"
【Wow, my Fangshen】
【No wow】
[Woo hoo hoo, when is the next live broadcast?]
[I have a hunch that the next live broadcast will be the next time]
The rope floated slightly, and Bi Fang hung in the air, with his back to the setting sun and his body covered in gold. He extended his hand to the drone directly in front of him and gave a two-finger salute, and finally slowly lifted off and disappeared.
The screen is completely black.
In the first venue, everyone faced the dimmed big screen and let out a sigh of relief, feeling quite unfinished.
In the past twenty days, the shock brought by Bi Fang was no less than any previous live broadcast. Although it was not a life and death crisis, a steel dagger was enough to make people fall to the ground.
Fang Shen’s live broadcast room is worthy of its name.
If you don't know where the greatest adventurer of this century is, then turn on the live broadcast and he will definitely appear.
The helicopter slowly rose into the humid night sky. After an unknown amount of time, the sky turned completely dark.
The city is like a gradually enlarging luminous body, and then the lights of thousands of houses in Banna gradually become clearer in sight through the wet windows.
Further away, large tracts of rainforest were extremely dark, slowly turning into a handful of small rainforest, and finally into a single tree.
The flowing air blew past the porthole, leaving only a dark sky and clear-cut gray and white clouds in the field of vision.