Beside the endless galaxy, a pure white fortress floats. The shape of this fortress is very strange, there is not a sharp angle as far as the eye can see, all the walls are round, there is not a single gap between the walls, it seems to be a complete one.

Inside the fortress, in a small space at its core, the curved walls were as bright as lamps, although completely transparent. Not far away, a wave came, causing the entire white fortress to tremble slightly.

"It's over?"

The creature in the arc space "walked" out of the wall and waited silently beside a strangely shaped machine.

This machine is like a horizontal funnel, one big and the other small.

Slowly, a cloud of "mist" floated out from the larger end, in which colorful particles collided, but it looked very unstable and seemed to diverge at any moment.

"You're not very good." Said the creature in the arc space.

"Si, I'm going to go again."

There was silence for a long time.

"Forgot the past?"

Again there was silence for a long time.

"I'm going to go again."

"Nope."

"Then I'll blow it up."

"Agree with you to go again."

Si was about to walk back, when he suddenly remembered something, turned around and said, "Spirit matter? ”

"Forget."

"......, the contract is torn up, as soon as possible."

"Where are the previous generations still holding on?"

"Reluctantly."

The fog suddenly became more erratic and spread in all directions.

"Relax."

"I'll do it as soon as possible, I've got to push the physics of that world."

"Familiar."

“……”

The fog unexpectedly didn't answer, and silently walked into the machine again.

October, 1900, Germany.

A gentleman with glasses sat at his desk with his hand over his forehead, his other on the wooden table, knocking regularly and with a deep sound striking the walls of the room.

At the moment, there is not much on the wooden table, just a piece of paper.

Yes, just a piece of paper.

There's not much on paper, just a formula.

But the man who wrote it—Mr. Planck—was skeptical, doubtful that he would be able to withstand the paper.

Is it good or bad? Thanks to the cat, he had the opportunity to discover the formula – hopefully discovering rather than creating. But if it's a discovery, then the formula behind it......

What he didn't know was that he did endure it, and he was going to be a trailblazer. Later, many people took this piece of paper and kept writing new formulas on it, constantly opening up this new continent without even seeing the end.

However, what really can't bear this piece of paper is physics.

Planck blackbody formula.

BC, Greece.

A warrior is gearing up. He held a shield in his left hand and a sword in his right, and he was majestic. In the past, he was invincible, almost invulnerable, turned defeat into victory several times, and fought bravely.

And today, some people even said that he couldn't outrun a turtle.

If it were normal, he would not have paid attention to such things, and he would have only resolutely obeyed the king's orders.

But now, this person has provoked everywhere and made a fuss about this matter, and the whole world knows about it, so he has to stand up and meet the challenge head-on. You know, the grave grass of the person who challenged him last time has already bloomed.

The warrior snapped his arm and said it was time to start.

So, a turtle was placed to the left and right of the five Stedia in front of him. With a wave of his hand, the warrior rushed out like the wind, just as he usually takes the head of his enemy in battle, although now he has a turtle in front of him.

Thinking of this, the warrior held back the fire in his stomach and stared at the turtle closer, leaving only the dust billowing behind him.

It's about to catch up, and the five Stedia is a piece of cake.

There is also a Stedia, a half-Stedia, a float, a half-float.

We'll see, I'll overtake the turtle with ease, and this rumor will be self-defeating. How can a warrior like me accept such an insult.

Wait a minute, this turtle is also on its way!

If I and the tortoise were both moving forward at the same time, then the tortoise was also moving forward when I ran over just now, not even a Stedia. However, by the time I had run less than a Stedia that it had just walked through, it should have run several more floats, and when I had finished those floats, it had run forward again......

That doesn't mean I'll never be able to catch up!

Is the rumor right?

No, it can't be!

The warrior shook his head, rumors are rumors after all, the brilliance of the warrior is still shining on my shield, and my sword peak will unfold everything!

The warrior emptied his mind and rushed straight forward, expecting to see if he could outrun the turtle.

More than gone.

The miracle didn't happen, it was as easy as the wind blew the leaves.

"Hahaha, my rumors were broken by me." The warrior stood in front of a bearded old man with one hand on his waist, and pointed to his nose with the other, "It's ridiculous to say that I can't outrun a turtle." ”

The old man looked at him with a look of vigour, and showed an intriguing smile, which even dimmed the light on the shield a little, and the light trembled slightly.

"You hesitated, didn't you, Achilles?"

Yes, of course this story is not true.

The Warrior is the head of the demigod heroes of the Trojan War, Achilles.

The old man's name is Zeno.

What the old man didn't know was that after nearly two thousand years, this piece of paper on Planck's desk would give him the final blow of his paradox.

On December 14, 1900, the streets were bustling with shops, with a constant stream of customers coming in and out, and merchants trying their best to attract customers, after all, Christmas was approaching. The houses along the street are also bustling with activity, with early lights and a few pine trees standing in front of the door. On the table, a roast suckling pig with an apple stuffed in its mouth is steaming, fogging the window, and the children of the family are lying on the window, drawing circles on the window with their fingers.

In stark contrast to the floor-to-ceiling windows of shops and homes, pedestrians on the road are in a hurry. Everyone wrapped their scarves tightly and buttoned their hats out of sight, as if a blizzard was coming.

And that's exactly what happened.

In contrast to the joyous atmosphere outside, Planck was reading his paper, "Energy Analysis in the Blackbody Spectrum," word for word at a podium.

If the last time he knocked on the table, it only shook the walls of his room, this time, his voice shook the entire edifice of physics.

The people who were laughing outside didn't know what kind of milestones were being erected in this building.

"To find out the total energy U that N oscillators have

The possibility that we must assume U

is not continuously divisible, it can only be a finite sum of some identical parts......"

Limited sum.

If Achilles had been here, he would have jumped up and pointed at the old man's nose again and said, "Hear me, Zeno?" This means that the distance between me and the turtle cannot be infinitely small. ”

Although Zeno will only pout and scold him for being boring, and at the same time forget that the person who created this boring rumor is Zeno himself.

But it has to be said that Achilles is right that there is a limit to the division.

In an unknown hamlet, a group of teenagers are creeping through a wooden fence to a farmer's orchard where they have not seen for a long time.

Autumn is the time when autumn is crisp, and the teenagers unload the burden of the scorching heat and begin to "fight everywhere".

"Come on, let's split up and give him no one of these pieces. Who told him to meddle last time when we were stealing apples from the next village. We've been grounded for days! The leading boy said.

Everyone picked up the stones on the ground and attacked the apples on the trees one by one, and after a while, they were cleaned.

At last. Everyone's eyes unconsciously focused on a teenager.

The young man's clothes were worn casually, the edges were torn, but he didn't care at all. A straw hat was casually buttoned up on his head, but it didn't hide his messy hair. Showing a pair of tiger teeth at forty-five degrees to the sky, it seems to be remembering something.

"Hey, Catalpa, why don't you fight?" Someone else asked strangely.

The boy named Catalpa unhurriedly picked up a stone and chopped it at the apple. The apple dangled like a tumbler for a long time, but it didn't fall for a long time. The boy picked it up again and threw it out again, using all his might, but the apple seemed to be sucked on a tree, and had no intention of falling.

Everyone looked at his clumsy appearance, and some people began to laugh at him.

He picked up a bunch of branches unhurriedly: "Just wait for me to change something." ”

As he spoke, the branches flew out, stunned, and knocked off the apple.

"Look, it's useless to use a lot of energy, the key is to use the right thing." As he spoke, the tiger-toothed boy smiled brightly.

Of course, this is just a coincidence.

But what the teenagers didn't know was that this had actually happened in Hertz's lab.

Although it has nothing to do with knocking out apples, but using light to fly electrons.

The words of the Huya boy are also verified here.

No matter how hard you slash the stone at the apple, the apple will not fall.

However, if you switch to a branch, as long as you throw it at the apple, the apple will fall.

No matter how intense the light is, as long as the frequency is wrong, it will not shoot electrons on the metal.

Weird, isn't it?

1905, Bern, Switzerland.

A small civil servant is busy in the patent office, feeding his family on the meager income of a third-class technician, but he still has to do the hardest work. He felt that he could be worth a higher amount of money - a second-class technician. But there was no way, so the patent office only gave him a third-class technician - it was better to have than nothing. At least he has a stable job and a family, maybe the next moment a happy life is just around the corner? And I'm not very busy right now, so I can go for a walk and have a party with friends in my spare time. Okay, Albert, that's enough.

At night, the little civil servant played the violin silently, but a different storm was pregnant in his head.

It's amazing, isn't it?

It is frequency, not intensity, that determines whether light can produce electrons on metal!

You know, a miracle is a miracle!

It's like if you don't shoot an absorbent sponge fast enough, it won't be squeezed out of the water, it's incredible!

But if it's light, what makes sense......

The long violin song reverberates among the stars, slowly rippling in the night sky.

What's going on?

On the windowsill, a cat figure flashed by.

The next morning, the little civil servant hurriedly grabbed his clothes and shouted, "Honey, I'm going to be late." As he spoke, he ran out, only to hear a sentence from afar: The cement at the door is not dry, don't step on it."

Hearing this, Albert glanced at the cement road, and happened to see a black cat stepping on the road, and he felt a little funny, and couldn't help laughing. If you look closely, you can't know what is stuck to one of the black cat's feet, it seems to be a leaf.

The cat's paws wrapped in leaves are nearly circular when they step on the cement, while those without leaves are perfectly shaped like cat's claws.

The cat walked very strangely, sometimes with force, sometimes with no force—one foot deep and one foot shallow.

Worst! It's going to be late!

Albert, who had come to his senses, hurried towards the company.

But on the way, his mind was not idle. Dark round, shallow round, deep cat's paw, shallow cat's paw.

For a moment, it seemed as if a beam of electricity passed through his head.

"What did I just think of?" He muttered to himself, rubbing his head.

"What exactly did I just think of?"

Although he didn't know what it was, he had a hunch that that thing was the answer to his previous question.