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Originally posted by dez
edit part II: Also forgot to mention the sheer number. They always seem to be 'mass' sightings in every sense of the world where as in other places you hardly seem more than 1-3 in the same area.
Originally posted by CloudlessKnight
Maybe something to do with the Earth's geomagnetics? They could place facilities on the Earth's magnetic hot spots, maybe to power some sort of super alien technology.