That night, Bai Yang lay in bed unable to sleep.

He has been unable to sleep at night these days.

Today is September 29th. Tomorrow is the last working day before the National Day holiday. The holiday starts the day after tomorrow. Even though they are senior high school students, the Education Bureau gave them a full seven-day holiday and strictly ordered them not to make up classes.

There is no moon tonight, and it has not cleared up after the rainy day. The air conditioner hanging outside the wall is buzzing. The indoor temperature is set to 25 degrees Celsius. Although it is not hot, it is stuffy. It may be that the doors and windows have been closed for too long.

The carbon dioxide concentration increased. Bai Yang took a deep breath and raised his hand to his forehead.

He was wearing a white short-sleeved T-shirt and large black shorts. He bent one leg and lay motionless on the bed, but his thoughts were free of charge.

When the tritium tubes arrive tomorrow, he can start making time markers, stuff them into the time capsule, and bury them in the lawn next to the community square.

Where should it be buried?

Poplars outline the floor plan of the Meihua Villa community square in front of us.

That square is so big.

For a small thing like a time capsule, which is twenty centimeters long, if you find a place to bury it, you will have to use a tiller to plow the entire ground to find it.

It would be easier if she had a metal detector - just like the mine detector used by Japanese engineers to deal with landmines in the war movie Mine War, it sweeps around the ground like a lawnmower, and when it finds a mine, it makes a beeping sound.

Its principle is simple electromagnetic induction. As long as the girl holds the metal detector in her hand and scans the lawn, she can find the time capsule she buried.

Of course, it is also possible to dig up unexploded mortar shells.

So there needs to be a marker.

Buried behind the bench?

Or buried under a tree?

Bai Yang thought, there is no doubt that the marker is very important, but he cannot bury the time capsule in a place that is too conspicuous and easy to be discovered. After all, the thing has to be safely hidden for twenty years.

If you hide it in a place that is too easy to find, you may not be able to be hunted down by a certain Cheng Yaojin one day in the future.

Bai Yang can't even imagine how chaotic the world will become in the catastrophe that destroys human civilization.

He decided to visit the field again during the day tomorrow and find several alternative locations. This location must meet the following conditions:

First, concealment.

Undetectable for up to twenty years.

Second, safety.

It cannot be lost or destroyed in a disaster.

Third, make sure the other party can find it.

Therefore, there must be accurate coordinates. Even in the past twenty years, the other party can find the burial location based on the coordinates.

After I bury the time capsule, I tell BG4MSR the location and ask her to dig it out.

Bai Yang took a long breath.

This is really interesting.

Can the electromagnetic waves radiated by the radio really have the ability to travel through time? The 14.255MHz shortwave light emitted by the ICOM725 shortwave radio station is also an electromagnetic wave. Can light have the ability to travel through time?

Light may have the ability to transcend time. On any starry night, if you open your eyes and look up at the sky, the entire starry sky you see is very ancient.

To you, they are the past, to them, you are the future.

But can you talk to them in real time?

Can the future and the past communicate in real time?

The physics teacher hammered in the coffin: Impossible! The speed of information transmission cannot exceed the speed of light!

Bai Yang turned over on the physics teacher's coffin, turned sideways, and looked at the old black Icom725 on the bookshelf. Others always said it was a radio, but in fact its structure was indeed not much more complicated than a radio -

—The core of the radio station is just a set of simple LC oscillation circuits, and the basic components of the LC oscillation circuit are just an inductor and a capacitor. You can buy an inductor for two yuan on Taobao, and you can buy a capacitor for two yuan on Taobao.

A lot of them, these two things can produce high-frequency oscillating current when connected together, and radio stations like 725 that use quartz crystal oscillators are more trouble-free. When the crystal is powered on, it can vibrate, just like He Leqin stepping on the switch, but He Leqin only takes one second.

Shake several times, the crystal oscillator shakes millions of times per second, and the high-frequency oscillation signal is emitted through the power amplifier and antenna. This is the principle of the radio transmitter... With such a simple structure, it is said that it can travel through time.

It's better to say that you can build a spaceship with wooden boards and nails.

There are many things in this world that seem mysterious and mysterious, but once you peel off their shells, you will find that they are nothing more than a grassroots team.

Bai Yang turned over again, lying on his back and looking at the ceiling.

The light in the room was very dark, and the white roof of the bedroom could no longer diffuse enough light into Baiyang's eyes, so in Baiyang's eyes it was not white, but it was not black either, just like the scene he saw after closing his eyes.

, you can hardly tell it is a certain color, it is blurry and dim, as if it is beating with noise from an old black and white TV.

Bai Yang took out his cell phone from under the pillow and turned on the flashlight at the ceiling.

The bedroom suddenly lit up, with a huge white spot on the ceiling. At this time, the path of the light was clear and followable. Bai Yang thought of the electromagnetic wave propagation path of the radio station. The radio waves radiated from the antenna of the radio station and traveled dozens of kilometers upward.

Touching the ionosphere, it is reflected back - just like the flashlight in Bai Yang's hand at this moment, the light is emitted from the LED, touches the roof upwards, and is reflected into a pair of open eyes -

The girl blinked.

Banxia lay on her back on the bed, staring blankly at the white spots on the ceiling.

She shook the small desk lamp in her hand, and the light spots on the ceiling also swayed. To be honest, this game was quite boring. She was not a cat and was not interested in the light spots dangling around.

But she had nothing else to do.

Can't sleep at night.

Banxia turned over and lay on the bed. She was wearing a white vest and black pajamas on the lower body. She hugged the pillow and buried her face in it. Then she raised her two calves and patted the bed board again and again, very hard.

, a "bang bang" sound.

After a few minutes of filming, she stopped moving again and lay straight on the bed, her face buried in the pillow, like a corpse.

So annoying.

Tomorrow - at most the day after tomorrow, BG4MXH will tell him where to dig for treasure.

Can this plan really succeed?

So annoying, so annoying, so annoying, so annoying.

If you can't succeed, take the dog's head from his neck!

snort!

Banxia raised her hand and drew it in the air.

No, he is the only one who knows me. If I lose this one, where can I find the next one?

So Banxia stretched out her hands to put her head back into the void.

Sure enough, it was her menstrual period, and she wasn't usually so anxious. Banxia raised her face, sighed, spit out the hair in her mouth, then turned over and lay on her back on the bed, holding the lamp on her head.

in hand.

She regularly pressed the lamp switch in her hand to make the light flicker.

The teacher once taught Pinellia how to send CW equal-width newspapers, which is Morse code, but Pinellia is not very proficient in using it because it is rarely used.

Long or short, click click.

"G."

Banxia thought silently in her heart.

Long, long, long, long, long, long, long, long, long, long, long, long, long, long.

O.

Long, long, long, long, long, long, long, long, long, long, long, long, long, long.

O.

Long or short, click, click, click.

D.

"The next step is..."

Short long short, short long short, long short long short, long short long.

LUCK.

"Good luck."

Short short, short long, short long short, short long short, long short long.

"HAPPY."
Chapter completed!