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Not to say they are making visits to toothless men

That's exactly right! You have to understand how these space aliens think. They spend years looking for one person that no one will believe, and then while he is stumbling in the desert in a drunken stupor - whammo - they grab him, take him to their spaceship and perform all sorts of really weird experiments on him. Then, just to make sure that no one believes him, they telepathically beam messages to his brain that say: Jim, you are the special one - tell everyone of the great space thermos!