Metalworking, an extremely ancient craft, has its origins even before recorded history.

Until thousands of years ago, human knowledge of iron, the most abundant metal element on the planet, was almost blank.

Both the ancient Egyptians and the ancient Sumerians believed that iron could only come from shooting stars and was a gift from the gods of heaven.

Although later civilizations discovered ways to smelt iron and entered the so-called Iron Age, they still did not know how to obtain stable iron tools that were strong and not easily brittle.

But iron is too fragile, soft and not sharp, far less useful than copper.

Until a great people discovered steel, they used the hammer in their hands to sweat and blood over and over again to forge a stable enough hundred steel.

This piece of black metal has finally officially become the protagonist.

But its production is too expensive, too rare, from mining to transporting ore, to smelting, forging, each iron sword, it takes countless manpower and material resources.

Finally, in the era of the Industrial Revolution, people finally discovered how to obtain tough, durable, and even cheap iron.

Now, high-quality steel can be found everywhere, high-rise buildings, cars and ships, railways and trains, bridges and towers, for less than two pieces, you can get a pound of iron in the scrapyard.

Black metal, complete the transformation from the mysterious to the ordinary.

The mystery of iron has long since faded and become accustomed to it, and the steel industry has become a spectacle of the new era.

Majestic blast furnaces, as tall as several floors, run 24 hours a day, reach temperatures of thousands of degrees Celsius, and no living organisms or water remain in the scorching molten iron, requiring the cooperation of many engineering personnel.

The entire steel mill is like a giant monster that never rests, devouring ore, coal, and lime.

The products produced by modern steel mills are of high quality and stable quality, enough to be regarded as a miracle by the ancients: only with the help of the gods, can craftsmen come together with superb works.

Now, everyone forgets that the history of the development of this ferrous metal, even half a century ago, it was still hard-won.

It was only then that a man, an almost naked man, in the midst of the most primitive and savage rainforest, out of dirt and stones, from nothing, had accomplished something that could be called a spectacle and make people recall it again.

Oh, that's how the original iron and steel were made.

He smelted iron, made iron more stable steel, and made steel, and finally became a sharp blade.

He was an adventurer, a lover of nature, a man with madness in his bones.

In front of a total audience of more than 10 million people, this condensation process of human history progress was completed.

At this moment, six million spectators watched, let out a frantic cry, screamed, and they responded to the moment with the most excitement.

[Ao Jing presented the anchor yacht *1 - Fang Shen is awesome! ] Humans are awesome! 】

【Ashtray Gift Change Anchor Spaceship*100-niu~~~bi~~]

[, when will the wolf teeth still be able to send pictures? ] 】

[No, it's just sketched out in your own mind, hahahaha]

[Gift to the anchor spaceship*10 - can be used as a treasure of the town store]

[It's you!] Yao Jun, you profiteer! I spent 300 yuan to buy bamboo, and I didn't succeed in lighting a fire once.

[Mr. Yao is really a genius in some ways, every time I buy it, I feel like a big wronged seed, you black-hearted maggot! 】

[Profiteers! Evil business! Black Merchant! (Ma Chao Sanlian)】

Yao Jun, what's wrong, everyone is so resentful?

Bi Fang looked puzzled, but he believed that Yao Jun would not mess around with the club.

The hot sand distorted the heat.

Subtle changes occur at the onlooker level, with the grains becoming thinner, denser, and tighter, like twisted tendons.

It would be a good knife.

Bi Fang collapsed to the ground, closing his eyes and enjoying the moment.

Finally it worked.

Next, as long as you put on the handle, polish and polish, it is a formed dagger.

A steel knife.

A blade that has a higher degree of mission completion than the Iron Knife required by the system.

Gradually, the snoring began to rise.

The audience was stunned for a moment, at first they thought it was a strange sound, but after a while, they realized that it was coming from the microphone, and they saw Bi Fang with his eyes closed and facing the sky.

Only then did everyone remember that in order to catch up with the progress, Bi Fang had not had enough rest for several days, and he didn't sleep all night last night, striking iron all night, coupled with intense physical exertion, he was already extremely tired, and he was finally able to relax, and he fell asleep directly.

[I rub, is this asleep?] 】

[I can't help sleeping, there are still three or four hours before the helicopter comes]

[Damn, get up quickly]

......

[The old party is about to get up, it's more than five o'clock]

[It's six o'clock!] 】

[Helicopter is coming]

Under the sunset, the audience kept shouting, but Bi Fang had already entered the dream.

Moments later, the helicopter flew in, and the electronic sound that had not been seen for a month sounded again.

[Ding, the main quest 3 failed, and the completion degree is low. 】

"Huh?"

Bi Fang woke up suddenly, sat up blankly, and then covered his swollen head.

It hurts.

It is as if there is magma flowing in the narrow cerebral blood vessels, burning the thin blood vessels, flowing into the brain, and finally cracking along the skull along the bone seams, rubbing, and turning into charcoal in the heat.

Remembering the nightmare he had just had, Bi Fang opened his eyelids wide and asked the audience how long he had been asleep.

[It's just more than half an hour, it's early three o'clock, and it's not even four o'clock.] 】

"Whew, I'm sorry, I'm so sleepy, I fell asleep as soon as I relaxed a little."

Bi Fang stood up on the ground, took a few deep breaths, and finally bent down to make a gesture of touching his toes, and only stood up after about ten seconds, and he was obviously more energetic when he got up again.

But the exhaustion remains, only less sleepy.

"If you are sleepy and want to wake up quickly, then you can try what I just did, when your head is lowered, the blood will be concentrated in the brain in a short time, so that the brain can get a lot of oxygen and nutrients, so that the brain will be active again."

"Before doing it, you can also use deep breathing to briefly increase the oxygen content of the blood, which has a miraculous effect, I used to be sleepy in class, and I would 'accidentally' drop the pen under the desk, and then bend down to pick it up for ten seconds."

[I'm sleeping when I'm sleepy in class, and I'm picking up a pen when I'm sleepy, no wonder I can't understand anything now when I watch a live broadcast, and Lao Fang is getting more and more awesome]

[Hahaha, it's too real]

[What to do in the office]

"There is also a way in the office, you can straighten your back, lift your feet flat, and strain hard."

Bi Fang sat on a rock, the whole movement was like a sit-up halfway to a pause, the abdominal muscles tightened, and the anterior serratus muscles on the costal side rose and fell like shark gills.

"Many people will feel sore if they insist on more than ten seconds, in short, they are quite tired, the principle of this action is that when the muscles are active, your sympathetic nerve will be excited, activate the 'hypothalamus-pituitary-adrenaline' system, secrete adrenaline, and take the initiative to give your body chicken blood."

Half a minute later, after doing two sets of movements, Bi Fang refreshed his mind and was full of energy, came to the blast furnace, removed the stones, and stirred the hot sand with branches.

After half an hour of cooling, the hot sand is no longer hot.

[Anyway, where did the sand come from... 】

[Damn, I also found out, where did the sand come from in the rainforest]

"Where there is soil, isn't it easy to get sand? Understand the principle of soil desertification. ”

If the vegetation, litter, and crust that play a protective role on the soil surface are broken, the exposed soil will quickly dry out under the action of sunlight and monsoon, and the original aggregate structure will be destroyed and lose the effect of adhesion.

Nutrients such as fine particles are carried away by wind or precipitation, and coarse particles without nutrients are left behind, forming desertification.

"What can be done by natural air drying, artificially faster, as long as the soil is removed from dead branches and stones, and the soil is constantly heated, rinsed, and reheated, and the soil can be crushed like sand."

Bi Fang poked it with a branch, poked the dagger, and fished it out.

Shake off the sand above, and the steel dagger finally reveals its full picture.

But......

It's not pretty.

It is not as cold and cold as the audience imagined, but it is pitch black, and blue light can be reflected in the sun.....

Bi Fang didn't care, it was like this just after it was processed, and when it was polished, it was shiny and shiny.

He took out a polished log, cut it in half evenly, and then printed it on the thin handle of the dagger, and when he had the seal, he grabbed the dagger and cut it on the mark, each cutting a groove that could accommodate the thin handle.

The two logs are kept closed, and when they are the right size to fit in without being too loose, the collected rubber resin, or latex, is applied to them.

"Natural latex has a very good viscosity after natural air drying, and if there is a condition, it can also be vulcanized, so the viscosity will be higher, but I don't have enough time, so I need to install the wooden handle as soon as possible."

Glue two semi-circular logs together, wait for the air to dry and stick firmly, Bi Fang takes out the stone dagger, quickly carves the handle, makes an oval curve, makes a rough appearance, takes out the smooth rough stone and rubs, and polishes the burrs on the wood smooth and even.

In the last step, the slender rattan is evenly wound around the wooden handle, fixed it for a second time, and placed in the latex for the final adhesion.

Vines wrapped around the wooden hilt, spitting out the black-bladed six villages, the tips glittering with a little cold.

Now, all the work is done, and the dagger is completely formed.

Bi Fang looked at the shelter and blast furnace behind him, the bits and pieces of the twenty-one days flashed in his mind, and finally he held a cautious stone hammer and stood and stared at it for a long time.

Finally, it smashed on the chimney, and the cracks spread out like spider webs.

The crack gradually spread, turned into a crack, and broke with a bang, and the three-meter-high chimney fell to the ground, shaking the earth.

The water monitor lizard shuddered slightly, quickly fell from the tree, burrowed into the cave, and hid in the deepest part.

Dust to dust, dust to dust.