People have been in contact with aliens since the time of mastering writing. Those who came into contact with the humanoids believed that the aliens were gods who descended from heaven. Descriptions of alien spacecraft have been found in several ancient records. So in Indian books they are described as flying balls with a mercury engine. And about the people sitting in these balls, it is said that they can move anywhere with great speed.
In the 20th century, people who came into contact with aliens and tried to tell about it were diagnosed as mentally ill and tried to isolate them from society. Often they became victims of interrogations by the special services and nothing is known about their further fate.
The situation changed by the end of the 20th century. The influx of UFOs on Earth has increased, and it has become simply impossible to keep the cases of contacts secret.
The eyewitness accounts are largely the same. The aliens who visited the ship were surprised by the absence of any elements of the ship that are familiar to our understanding - cables, pipes, levers. They fell into lighted rooms with glowing ceilings. In some rooms, they saw chairs, monitors and a control panel. Also, the appearance of the aliens differed from the image of green men that had settled in our heads and had huge eyes and an elongated skull. Contactees describe the aliens as beautiful, human-like, white-skinned and fair-haired creatures.
For some people, contact with aliens is psychologically damaging. In many cases, such people need a rehabilitation course. So some of the contactees can, in a state of hypnosis, tell interesting details of their stay on the ship, while the memory of others can be completely blocked. Some contactees have alien implants in their bodies. But there are no traces of cuts or operations on the body.
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There are two versions of the appearance of aliens
First, the aliens are representatives of extraterrestrial civilizations. In this case, all research and experiments on people have the goal of studying the structure and work of the human body, the environment. They allow us to evolve in the direction they need. And it is also possible that for representatives of extraterrestrial civilizations, earthlings are just experimental samples, consumables for experiments.
The second is the descendants of earthlings who come to us from the future. What is the purpose of human research in this case is not entirely clear. It is possible that the earthlings of the future have a genetic failure that led to some consequences, and they are looking for solutions in our time.
One thing is clear. People should be wary of encounters with extraterrestrial intelligence.