The War with the Fnools
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"The War with the Fnools" is a science fiction short story by Philip K. Dick. It was first published in Galaxy magazine in 1969.[1]
The Fnools are invaders in the guise of two-foot-tall human beings. They take on the guise of Volkswagen mechanics and other similar business practitions. A discovery is made by a Fnool that if one of their kind partakes in an activity associated with growing older (in this case tobacco and alcohol), the Fnool will double in height. The knowledge is spread, and as a result, the Fnools become indistinguishable from human beings.
Dick said of the story:
"Well, once again we are invaded. And, humiliatingly, by a lifeform which is absurd. My colleague Tim Powers once said that Martians could invade us simply by putting on funny hats, and we'd never notice. It's a sort of low-budget invasion. I guess we're at the point where we can be amused by the idea of Earth being invaded. (And this is when they really zap you.)"[citation needed]