ELi5 Why can flys see you coming a mile off when you try to swat them…but they can never seem to find their way back out of an open door?
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Open your front door just a crack, and you can feel air moving between the room you’re in and the outdoors. An open door has no discernible wind to us, but to a tiny fly, it might just be too breezy. Like trying to paddle a boat against the tide.
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