So invisible jets (with wondrous pilots) when?

(Or do we just wait for pollution to turn the rain acidic like this?)

Weird af (I mean amazing).

And without knowing any background (of which I’m sure there is loads) even weirder someone set out to test that.

Just regular hell (other people) so far, what horrors will the discovery of a more advanced “holy hell” bring to humanity only time will tell.