A good movie always has a clear narrative, never drags the mud and water, and every sentence and action plays a big or small role.

An excellent science fiction movie not only needs to have the above conditions, but also has a novel and distinct scientific core, and even if it is plausible, it must be able to justify itself.

If "Avatar" is soft science fiction, and "Inception" is both soft and hard science fiction, then "Source Code" is pure hard science fiction.

There are four aspects to the principles of science: psychology, computer programming, neuromedicine, and quantum mechanics.

If you imagine that someone gives you a mobile phone number and asks you to call it immediately, you repeat it, dial it out smoothly, and wait until you finish the call with the other party, and then recall this number, do you basically not remember it?

The human brain has such a short-term memory function, the massive amount of information received by sight, smell and hearing, the brain is first placed in a specific memory area, in a certain period of time, these memories are very vivid, once the time is exceeded, the later information will cover the original information, although it still exists in the cerebral cortex, but it is very difficult for you to extract it.

The so-called "8 minutes" set by the director is based on this psychological research. Counting from the moment of the death of Sean, a passenger on the train, he had 8 minutes of memory remnants, and since his nerve cells were not completely dead, this information was extracted by the military.

In some of the original science fiction, this information was reduced to images, and it was still a fragmented and messy image. But in this film, this information is processed into computer data, like a single-player game, and magically, the data has the ability to perform its own calculations.

In other words, it is an artificial intelligence that can produce logical changes based on different situations, and this is not predetermined.

All suspense has to find someone to play this game and search for clues to the murderer in the ocean of data. This person must have three conditions: first, he must be able to deduce consciousness into program code, second, he must have keen reconnaissance ability and strong psychological quality, and third, he must be able to switch between reality and game at will.

It wouldn't be surprising if that's all the science at the heart of the film, but it also tries to explain the self-computing power of the game world, which is the superposition of the famous superposition of quantum mechanics.

To put it simply, at the quantum level, a cat can be both alive and dead, as long as there is no conscious observer, the state of death and life is at the same time.

In the game world, there are an infinite number of superpositions at the same time because there is no observer. So every time the protagonist enters this world, it's actually different. The world is divided into countless worlds, which are actually jumping back and forth in different parallel worlds.

But in the end of the development of the plot, it is obvious that even the military did not think of the technology invented by himself, which is clearly the door to the parallel universe. In the real world, although the existence of parallel universes has been deduced in theoretical physics, no one knows how to connect with the universe next door.

Technology is the key to unlocking the parallel universe, and because of this, after the protagonist is cut off from the nutrient solution, he can live happily with the heroine in the last universe he enters, but he can never return to the universe where he was originally located.

Ding Cheng believes that the best thing about this work is not that the advanced scientific setting is simply and plainly narrated, but that the details are completely in line with the actual situation of the characters.

The protagonist's body has been damaged, but based on the medically proven phantom limb phenomenon, that is, after the amputation surgery, the patient will have hallucinations of the amputated limb that still exists, plus some suggestive guidance, so there are hallucinations in a sealed cabin, and there is a video display like a television set, in fact, those images are projected directly onto the nerve endings.

After gradually learning the truth, an accident occurred, the sealed cabin ran out of power, and it became colder and colder, and he crawled on the ground to find tools to repair the circuit, and lost contact with the outside world.

The director hints at the subconscious rejection of the real situation, there is no mechanical failure, and it is the protagonist who wants to die, so there are hallucinations such as oil leakage and almost freezing to death when the power is out.

Proving the tremendous lethality of despair to people.

The film is rational, and the only emotional plot appears at the end of the film, in that parallel universe, pretending to be his comrade-in-arms to call his father, but he has his last wish.

Because it's bland, it's touching.

The work is beautiful and heartwarming, and despite the suspense and tension elements, in the end everyone gets what they want. The protagonist comes to terms with his father and finds love in a new world.

The passengers in the same car escaped and continued to live happily, even though they did not know that they were about to go through a catastrophe.

The liaison officer obeyed the choice of conscience, and although he disobeyed the orders of his superiors, he was not punished because of the influence of the new world.

Even the inventor of the source code, the ambitious cripple, although his success eventually bypassed him, was still full of hope and high morale......

In a movie, everyone has their place, can you say that it is not warm and beautiful?