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You install an anti-mosquito laser and a week later find a family of pixies dead on your lawn with horrible burns across their bodies

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but the anti-mosquito laser first identifies the target by wing beat frequency. pixies are larger, therefore lower freq

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I knew that but I liked the idea too much, sometimes I take liberties worldbuilding

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and

conceivably you could make it work by saying "pixies disguise themselves as smaller flies" but that's meh