It looks like the aliens on Earth not just feel like home, but also a mark of our teachers. Often in close contact with people Pilots UFO send them some information. This may be the scientific and technical information, data on other worlds of the universe and so on.
And like, aliens do not particularly care what Earthlings perceive their information and then how to use it. And sometimes it happens that by sharing knowledge with the man, the aliens immediately erase from his mind all the memories of meeting them.
A typical example here – the history that took place in 1961 and their spouses, Betty and Barney Hill. In the evening on a deserted highway their car was stopped by overflying discoid object with two rows of red lights and side windows, which could see the silhouettes of men. Then, in Hill, probably had a failure in memory, because they suddenly found themselves 56 miles from the place where they met the object. Later, under hypnosis, couple recalled how humanlike beings forced them out of the car and climb into the aircraft, which first examined them carefully, and then read them a short lecture on the structure of the universe, and found star map and star in it with which they arrived . Betty Hill was able to even recover the map, and then experts, having studied it, recognized homeland kidnappers Beta Reticuli star system.
The mysterious metal spheres that catch people in different parts of the world. In 1966 in Arkansas (USA), several witnesses watched as the only one ball diameter of 28 inches has fallen from a completely clear sky. When the "flyer" raised on a perfectly smooth surface of the ball there was no trace of it passes through the atmosphere and do any damage.
Three lying near each other ball of metal discovered in 1963 in the Australian desert. All of them had a diameter of 35 cm, each weighing about six pounds. Coverage of balls was as if polished, without connecting joints and injuries. Reveal the strange things the Australian scientists have not succeeded, and the balls went to the U.S. for more thorough study.