Video spoilers history, starting with the blitzkrieg on Poland

A new sky screen appears.

The opening begins with a piece of music.

[“Today is a good day. Everything you wish for will come true…”]

And along with the cheerful music.

It's an explosion!
A huge and dazzling explosion covered the entire sky.

In the rising mushroom cloud, countless people wailed in pain, but were instantly vaporized by the huge explosion.

And the sky curtain also sounded in a voice that was difficult to hold back:

[In the world of elements, there is such a metal. ]

[It is like a dangerous killer hiding in the dark, and every move it makes affects the fate of mankind. ]

[It is uranium, known as the most dangerous metal on earth. ]

This metal has the amazing property that it can be ignited with just a match.

[The instant burst of energy is enough to make people feel how violent its "temper" is. 】

[Pure uranium is unremarkable in appearance, with a dull grey hue.]

[This is because uranium is extremely chemically active.]

[Its surface easily reacts with substances in the air and is rapidly oxidized.]

[But uranium does not exist alone in nature.]

[It is often hidden in uranium and calcium mines. ]

[Uranium-containing ores are like gems carefully crafted by nature, showing a beautiful yellow-green color. ]

[In the past, discerning glass craftsmen were attracted by this unique color and introduced uranium into the production of glass products. ]

[Under the caress of the sun, uranium glass shines with a bright green light. ]

[When exposed to ultraviolet light, it also exhibits magical fluorescent properties, as if it has life. ]

[For this reason, uranium often appears in cartoons as a green glow, becoming a classic symbol of science fiction elements.]

【However, the glass craftsmen at the time did not know this. 】

[This beautiful material in their eyes actually hides huge harm to the human body. ]

[Modern people naturally know this, so they attach great importance to uranium. ]

[To prevent uranium from acting recklessly, it is usually stored in argon gas.]

[Almost all experiments on uranium must be conducted in a safe room created by argon gas.]

[Uranium is cut into thin pieces for study.]

[Once these fragments are exposed to the air, with its extremely high activity, uranium will burn normally in the air like a flame eager to burn, and eventually produce uranium octoxide. ]

[This is one of the most important and stable forms of uranium oxide. ]

[When uranium meets nitric acid, a wonderful chemical reaction occurs to form uranyl nitrate. ]

[During this process, the unique luster of the original surface of uranium will be clearly revealed. ]

So, what exactly is the reason why uranium has earned the title of "the most dangerous metal on earth"? 】

[The answer lies in its close connection with the atomic bomb.]

【Uranium is the key raw material for making atomic bombs. 】

[When two pieces of enriched uranium in a subcritical state come into contact with each other, once the mass of the uranium reaches the critical point, the uranium will begin to split under the stimulation of a large number of neutrons.]

[It triggers a horrific chain reaction, releasing a huge amount of energy that is enough to destroy everything. ]

【That is, the atomic bomb. 】

【August 1945, 8, is a milestone in human history.】

[At that time, Japan was at the end of its rope during World War II, and millions of American and Soviet troops were approaching. ]

【But the Japanese emperor threatened to kill 100 million people and fight a decisive battle on the home front. 】

[The United States was also hesitant because they estimated that a forced landing in Japan to end the war would cost more than 100 million or even 200 million casualties.]

【The United States does not think it is necessary.】

[At this time, an atomic bomb named "Little Boy" exploded over Hiroshima, Japan. ]

[Instantly, the ground temperature at the center of the nuclear explosion soared to more than 4000 degrees like a rocket out of control.]

[Those residents who were standing at the center of the explosion were vaporized by the high temperature in the blink of an eye.]

【Disappeared without a trace.】

[Only carbonized black shadows are left on the ground, silently telling of their past existence. ]

[Immediately afterwards, a devastating shock wave with an initial pressure of nearly 7 tons per square meter swept through the entire city of Hiroshima like a surging tide.]

[Under the impact of this powerful force, the city center was razed to the ground in an instant.]

[Nearly 600 buildings collapsed in the violent shock, turning into rubble all over the ground.]

[In the first few seconds of the explosion, about 8 lives were lost.]

[The city of Hiroshima seemed to have experienced the end of the world. ]

[The sky collapsed and the earth split, everything was in chaos. ]

[The atomic bomb made of uranium announced to the world the tremendous power of nuclear weapons. ]

【Two atomic bombs destroyed Japan's will to resist. 】

【Nine days later, Japan surrendered and World War II came to an end.】

Outside the sky.

Qin Dynasty.

Ying Zheng pointed at the tragic scene of the atomic bomb explosion on the sky, suddenly sighed, and said:
"pity."

At this moment, the officials of the Qin Dynasty couldn't understand. Although the invasion of China by Japan was a future event, it had nothing to do with the Qin Dynasty where they lived.

But it is still a very unpleasant thing.

At this moment, I saw Japan being bombed by an atomic bomb in the future, and it was screaming in agony.

Logically speaking, it should be very satisfying.

But why did His Majesty the Emperor sigh and say "what a pity"?

Amid the puzzled gazes of the crowd, Ying Zheng sighed again and said slowly:
"How good was Japan's '100 million suicides' plan in the beginning?"

"If they really want to fight a decisive battle on their home soil, once millions of American and Soviet troops land, after a major war, I'm afraid the entire Japanese island will be uninhabited for thousands of miles."

"How many more than a million people were killed or injured?"

"But now that two atomic bombs have been dropped, we don't know how many people died. Maybe at most 200,000 or 300,000 people died, and then the war was over."

"This atomic bomb saved at least several million Japanese lives."

After saying this, Ying Zheng continued to look at the sky with a hint of regret.

[But for many survivors of Hiroshima, the disaster was just beginning.]

[A large amount of nuclear radiation gushed out from the center of the nuclear explosion, which mercilessly penetrated people's skin, wantonly destroyed cells, and destroyed the basic structure of living tissues. ]

[Thousands of people died within days, weeks or months from this terrible radiation.]

[Infertility, cancer, leukemia, cataracts and many other diseases, like nightmares, tightly shroud this land that has suffered so much, leaving the survivors struggling in pain. ]

[Oppenheimer, the leader of the Manhattan Project, once lamented after the project was completed:]

[“Now I am the god of death, the destroyer of worlds.”]

【To some extent, this statement is not false. 】

【It is the most realistic portrayal of the huge destructive power brought by uranium. 】

[It is worth mentioning that natural uranium mostly exists in the form of the isotope uranium-238. ]

[It is not suitable for direct use in making atomic bombs.]

[Less than 1% of uranium-235 can self-sustain a nuclear chain reaction, making it the key to making nuclear weapons.]

[To use uranium-235 to make nuclear weapons, its concentration needs to be increased to 85%. ]

[The concentration of uranium-235 in nuclear fuel used in nuclear power plants is only 3%. ]

[People usually use centrifuges to centrifuge uranium hexafluoride to achieve uranium-235 enrichment. ]

[In this process, the unwanted uranium-238 will be discharged, and after being collected, depleted uranium with relatively low radiation will be obtained. ]

[Although depleted uranium has lost its ability to make atomic bombs, it has found a new use due to its extremely high density. ]

[It is often used to make bulletproof armor for tanks and depleted uranium armor-piercing bullets. ]

【It continues to play an important role in the military field. 】

The video ends here.

Barrages of comments flew out one after another.

"Provincial Flow: Being in the Radiation, Not Knowing It. "

"Sharing Uranium Radiation."

"At this point I quietly took out the Geiger counter my grandfather had left me."

"Where is the danger? The favorite element of JP people."

"Fine grape wine in a luminous cup, could it be that the ancients used uranium cups?"

《Temperature of the day: 15-4000℃.》

What happens if you touch highly enriched uranium with your bare hands?

"It's okay, just don't eat it."

"Uranium has a very long half-life, and its radioactivity is not that strong. It won't be a big problem as long as you don't eat it."

"A uranium metal mine is sold for a few dollars online. Is this true?"

"Yes, I've seen it too. It's like a small piece of iron ore. If you put it on ice, the ice will melt. If you put it close to a mobile phone, the phone will become blurry."

What do you think?

And outside the canopy.

tomorrow.

Zhu Yuanzhang watched the entire video and the discussion among netizens.

I basically understand it.

Zhu Yuanzhang said:
"No wonder Tianmu calls uranium the most dangerous metal in the world."

“It’s not the uranium itself that’s so dangerous.”

"It is that later generations of humans were able to use uranium to create various weapons."

"These weapons are extremely powerful and highly uncontrollable."

"But it must be said that if the Ming Dynasty also possessed such weapons, then the Ming Dynasty would be forever secure and there would be no more worries."

"Future Chinese must master the industrial technology of uranium!"

“Even if it is not actually used, it can definitely become an important national defense weapon.”

"Holding the sharp sword of nuclear weapons, we are on duty to protect peace."

But Zhu Yuanzhang paused again, and suddenly said ruthlessly:

"And if nuclear weapons are to be used, there are ready-made targets to use."

"Anyway, they have experience, so eating a few more shouldn't be a problem." (End of this chapter)