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Old_Honky - 10:06 am on May 16, 2008 (gmt 0)
The crop "circles" are deliberately made by the time travellers to confuse and annoy us. If it was Aliens they would have landed somewhere public and introduced themselves by now, as we would if we landed on another planet.
They aren't space travellers they are time travellers. It is no coincidence that there are many ufo sightings in the weeks leading up to events of great historical importance. Time tourism must be a big industry to our descendants.