UFOs have been seen in the skies for as far back as recorded time. Back in ancient times people who saw something up in the sky would describe it using whatever terminology they had. A flying saucer might have been described as being a flying shield. Back in the 300s BC Alexander the Great saw several flying shields that dove on his troupes. The UFOs caused a lot of difficulty with his men when the elephants they were riding became terrified and began to run around, stepping on anyone in their path. The word disc was in use back then but being a soldier, he was more inclined to use words associated with war than eating. The Hopi Indians have legends of flying shields that came from cities at the bottom of the seas. This brings to mind the concept that if aliens wanted to live here on our planet undisturbed by us the bottom of the oceans is about the most remote place they could find. Twelve men have walked on the surface of the moon but only three have ever visited the deepest part of the ocean.