But those discoveries are only recently known to the mass, because several decades ago it is hard to manage all the artifacts and archeological sites around the world. But now, with the development of technology it is easier to see the connection between an artifact somewhere in the South America and a pyramid in Egypt. While the early encounters can be traced back to the early historic age, the modern appearance of UFO are started to become popular in the World War II. A lot of pilot who engage in the war saw some weird flash of light that move in unrealistic way, floating in the sky and then zap out to the sky few seconds later.
Origin: ufos-and-aliens.blogspot.com
