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A fly's eye is made of thousands of lenses, so it sees a different world to us. They are also good at sensing movement. Mot of all, they are good at sensing changes in air pressure. If you're trying to swat a fly with your flat hand, you'll miss, practically every time, because they feel the change in air pressure coming. But, a flyswatter is a mesh - the air goes through it relatively unimpeded. They don't "feel it coming", and flyswatters are, by and large, very effective.

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14y ago

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