The room is not big, because of the metal "goose egg" standing and it looks tight, Su Yuan and Su Caiwei can only stand in a narrow corner and look up, but the effect of raising their heads to look at it highlights the huge size of this "goose egg".

The metal "goose egg" is supported by four huge steel structures more than 30 centimeters thick, which at first glance look a bit like the legs of spiders, because the lower end of the steel structure is wrapped with a thick rubber pad, so it does not cause puncture damage to the ground. The bending place of the steel structure is connected by several hydraulic devices, which should be able to shrink and fold.

Majestic, domineering!

This is Su Yuan's intuitive reaction after seeing the "goose egg", although it is not clear what it is, but just looking at its shape, it has a strong smell of metal technology, and in a trance, it seems that he can still smell a smell of engine oil floating in the air.

"Look at this thing, Mom, I picked it up when you were very young!"

Su Caiwei's palm was attached to the curved iron sheet of the white goose egg, her eyes narrowed slightly, Su Yuanzhi, who was familiar with her, said that the smile on her mother's face revealed the most sincere emotion in her heart, it was a kind of "pride", as if she had done a very remarkable thing.

However, Su Caiwei actually "picked up" such a big thing and came back, thinking about it carefully, it does have a great place.

"What the hell is going on, Mom, where did you pick this thing up?"

Just after recovering from the fact that there was a "goose egg" hidden in the basement of his house, the shocked expression on his face faded slightly, and Su Yuan was immediately thundered by Su Caiwei's words, such a big thing. Why can't I pick it up?

The corners of Su Caiwei's mouth raised slightly, and she said with a smile: "That was not long after my mother gave birth to you." It should be June of '93, when our family's Sumeng Stationery Factory was still in the expansion stage. One night it was raining, I gave your dad an umbrella, and when I passed by the construction site, I stumbled upon such a thing in our construction site. Later, your father came to see it, and asked people to erect a shed overnight to cover it, because of this thing, the construction of the construction site was stopped for nearly a month, and then the Longmen community was completed, and your father transported it to the house. ”

"That mom...... Do you know what it is?"

Su Caiwei shook her head, "I don't know." But listen to your dad, it's a time machine. ”

Time machine?!

Suddenly hearing this word, Su Yuan was shocked, she looked at Su Caiwei in disbelief, and said tremblingly: "Mom, you say ...... This thing is a time machine?"

"Yes, that's what your dad said anyway. ”

But...... Where can you tell that this is a time machine?

A metal "goose egg" with a waist circumference of four meters and a height of five meters, except for the strange shape, it is not like a contemporary product, and it is not written that it is a time machine! But thinking of the diary that Ji Ye Hao picked up, Su Yuan has eighty or ninety percent belief in the existence of a time machine.

If these two things are connected. Then the time machine in front of you is very likely to be taken back by the owner of the diary.

"Can I go up and have a look?" Su Yuan's heartbeat suddenly quickened.

Su Caiwei pursed her lips and smiled, "Of course you can, but the space in the basement is too small." The hatch of this goose egg won't even be opened, so we'll get it outside in the evening, and we'll let you try it then!"

Su Yuan thought about it too. It's only three o'clock in the afternoon, and it's easy to expose the time machine if you get it out too early. Anyway, I'm not in a hurry, it's a big deal to wait for the evening to see what is going on! Su Yuan's heart suddenly came alive, didn't Ji Ye Hao say that she would not be allowed to use [Backtrack], now it's okay, if something tragic happens again, she will use this time machine to save Ji Ye Hao and Xia Lin.

Her eyes narrowed slightly, and her good mood immediately spread throughout her body, and the whole person suddenly felt a lot more relaxed. Next, she summoned Ji Ye Hao, Gao Jun, and Xia Linfeng to her room and told them that there was a time machine in the basement.

Gao Jun was an anxious person, and as soon as he heard about the existence of the time machine, he wanted to go over and have a look immediately, but was glared back by Su Yuan. Ji Ye Hao didn't say much, but Su Yuan knew that he must be in a good mood. There is also Charlene, who also accepted the existence of the time machine after a short period of shock.

"Let's make an assumption that if this time machine is the owner of the diary, it can be seen from the fact that the events recorded in the diary are different from the history of our world, and the owner of the diary is definitely not from our world. ”

Gao Jun calmed down and slowly analyzed.

Su Yuan has no opinion on this inference, the jump of the boundary between the world and the world, only after the node of the "jump" will the history change, and everything before should be how it should be. Although Su Yuan's [Backtracking] also changed the boundary of the world, the history that was essentially changed was only a partial history after the arrival of the special combat soldiers and the shattering of space, and there was no difference in the history before using [Backtracking].

And the content recorded in the diary had diverged from reality earlier, so there was only one reason: the owner of the diary had already jumped the boundary of the world before Su Yuan used the [Backtrack] ability.

Then the time machine that the owner of the diary is riding on is a second-generation time machine that can jump the boundary between the world and the world, not the first time machine that only shuttles within a world line.

"With a time machine that can jump the boundaries of the world, we have the hope of changing the history of the past. But we can't be too happy!" Speaking of this, Gao Jun paused, sighed, and said: "The time machine inside a single world boundary line can go back and forth between the past and the future, because history itself will not change, but if the time machine jumps the world boundary, because the process of jumping obliterates the future of the original world line, then the jumping behavior itself is one-way. ”

"Can only go, can't go back?" asked Su Yuan in surprise.

Gao Jun lowered his head, "Theoretically, it's speculated to be like this!"

"So if the future is gone, will the jumping people disappear because of this?"

"I don't think so!" it was Charlene who answered Su Yuan, only to see her pick up a marker and write a few letters on the white tablet, "Let's assume that the total energy of the entire world is M, the sum of the energy of the time machine that jumped and the person who took the time machine is m, and the world boundary is the trajectory of all the particles in the entire world on the time axis, then it is like a closed tube......"

As she spoke, Charlene spent two parallel tubes on the white slab.

"At that time, the light machine jumped out of one of the tubes with the people who were boarding, so the total energy of the entire world that lost them became M-m, because the act of returning to the world boundary line triggered a certain mechanism on the timeline, so that all after they entered the tube again at this point in time, all became the energy form of M-m, and the energy of this M-m became another tube under the shape of the script of the new century and the boundary line, so when a person came by time machine' In the past, everything we see is shaped by the energy of M-m. ”

"In other words, with the m they bring when they return, the energy of the entire world realm is always equal to M?"

"Yes, this is the conservation of energy! Since the time machine and the people who ride it are m with real energy, even if their future no longer exists, their own existence will not be erased!"

When Ji Ye Hao heard this, he interjected: "Is it possible to understand it this way, if a person uses a time machine to travel to a year ago, then everything he sees is actually shaped by the new world boundary with the energy of M-m, and the characters and backgrounds in it are exactly the same as the world world a year ago, and even there is a 'he' in this world world, but the overall energy of this world is M-m?"

Charlene nodded, "Since the total energy m of the time machine and the people who ride the time machine is too small compared to the energy M of the vast entire world realm, and M and M-m are actually infinitely close, then the world world shaped by M-m is no different from the original world world. ”

Hearing this, Su Yuan understood.

To put it simply, the first (first) generation of time machines that shuttle within the same boundary line cannot change history, but they can freely travel back and forth between the past and the future, and all the actions of the travelers are what should have happened in history.

The time machine, which can jump the boundary of the world, can change history because it triggers a certain mechanism of the timeline, so that the entire world can start over. It is rather a violent process of destruction and reconstruction, and its shortcomings are one-way and there is no way to return to the future.

And her [Retrospection] is a little special, if there will be a "she" in the past when taking the time machine, then [Retrospection] is just a simple time rewind, from another angle, it can also be understood that she has obtained the memory of her future self.

So Su Yuan was a little hesitant about whether to use a time machine to change history.

If she takes a time machine to change history, then she can only stay in the past, and even if history changes, there will be two selves in that world, which is a more troublesome thing.

……

At seven o'clock in the evening, it was completely dark.

Under Su Caiwei's arrangement, Su Yuan, Ji Ye Hao, Gao Jun, Xia Linfeng, as well as Ji Shengchen, Su Yanjin and others gathered in their own yards.

I could only hear a loud rumbling sound, and the flower beds in the courtyard were constantly rising like a lift.

In a short time, the basement holding a huge metal "goose egg" rose to the height of the ground.

Su Caiwei stepped forward, found a secret door at the lower end of one of the four steel skeletons of the goose egg, lifted the lid, pressed the pneumatic switch inside, and with a "snort", the surface of the goose egg was two meters above the ground and suddenly opened the hatch.

"This is a time machine, it's a great machine!"

Gao Jun's eyes couldn't help but shine, and he was really shocked. (To be continued......)