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Double helix cloud over Russia
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C C Offline Oct 11, 2014 05:23 PM (This post was last modified: Oct 11, 2014 05:34 PM by C C.)
"...There is a fairly extensive investigation under way on the website metabunk.org which believes it to be some kind of contrail. ... Contrails or vapour trails are long thin artificial clouds that sometimes form behind aircraft. ... Depending on the temperature and humidity at the altitude the contrail forms, they may be visible for only a few seconds or minutes, or may persist for hours and spread to be several miles wide..."

That's not skywriting which uses a smoke generator to make "EAT AT JOE'S DINER" stuff. But deliberate manipulation of contrails to pursue a sky version of crop-circle art is probably an inevitable skill that was waiting to arise.
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