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  1. The thing is, what they’re seeing isn’t the contrails; they see an optical illusion from the image of the plane burned into the retina, like that trick where you stare at a negative image of the US flag for a few seconds and then at a white surface to see the flag the right colors. Since the aircraft is moving, if you stare at it, it will have a trailing afterimage that appears as a green or yellow film coming off the aircraft as you try and track it with your eyes.

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