As much as the planes flying over can get annoying, I like hearing the almost imperceptible secondary sound that follows the main booming of the engines, which is the sucking of the wingtip vortices as they whip themselves into nothing once the plane has moved on.

If you look up at these as the plane flies over, and the resulting white streamers which follow, you can see that they’re made up of cork-screwing air in long strips behind each wingtip. And then they disappear into nothingless.

Cool stuff!

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