Time travel or time travel, time travel, time travel, etc., generally refers to the movement of people or other objects from one point in time to another. In fact, all people follow the natural progress of time minute by minute, so time travel simply refers to the way in which time changes in our daily lives: either by a large number of trips into the future, or by going back to the past.

For physicists, time tunnels may be wormholes. Hawking said that wormholes are all around us, but they are too small to be seen by the naked eye. Everything in the universe has small holes or cracks, and this basic law also applies to time. Time also has subtle cracks and voids, and voids smaller than molecules and atoms are called "quantum bubbles", and wormholes exist in "quantum bubbles".

So theoretically, time travel is possible, and it is also diverse. There have been many similar mysteries and speculations in history and even in modern times. For example, there are many things and people in history who surpassed the technical and cognitive level of that era, and people who have achieved great things, and perhaps one of these things and people is a traveler from the future.

But no one has ever publicly admitted that he ever crossed over, because he didn't dare. If it is made public, then the world will not tolerate his existence. Because for those who explore the future, explore the unknown, a person who knows the future is simply terrifying.

The development of science is always based on people's continuous exploration and cognition of new things. And there are still many things that we can't understand with our current level of technology. Different people have different understandings of these things, and theists think that they are divine powers or magic. Atheism, on the other hand, considers it to be supernatural, while others call it a UFO event.

At the level of modern technology, it is difficult for people to understand such events. Therefore, supernatural phenomena such as time travel and rebirth are still in a vague state. This is just like the scientific community has always believed that gravitational waves do not exist in the past, but through the continuous development of science and technology, the objective existence of gravitational waves has finally been confirmed.

On October 16, 2017, scientists from many countries around the world held a press conference simultaneously, announcing that for the first time, mankind directly detected gravitational waves from the merger of binary neutron stars, and at the same time "saw" the electromagnetic signals emitted by this spectacular cosmic event.

Han Li crossed over, no, it should be said that he was reborn, without any warning, and when he woke up, he found that he was actually 18 years old again. It sounds ridiculous, but it's true. He pinched his skin countless times, until his skin was pinched by him, and tears flowed out of pain, and he believed that he was really back at the age of 18, at the crossroads of his life.