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"At the end of this puzzle, you have to affix the improbable cat hair moustache to your lip with maple syrup! Something of a Cyclic Trope, as genres tend to go through periods of death, rebirth and change. Also compare Trope Breaker, where it's a culture change or technological advance in Real Life that takes a genre down by discrediting one of its chief tenets.
History Channel, That’s Impossible, Weather Warfare & Chemtrails – a look as some of the claims on the Discover channel show on chemtrails.
Hazy Memories of Blue Skies – What do people remember about contrails? Britain From Above – Air Traffic 30 Years of Airline Travel Contrail Grids are not Chemtrail Grids There are a lot of jets in the air Theorists claim: “chemtrails” are not contrails, because contrails don’t act like that Reality: Contrails sometimes persist and spread, it depends on the weather at 30,000 feet (and not on the ground) Persisting and Spreading Contrails Contrail Forecast The opposite of contrails Measuring the height of contrails How Long do Contrails Last?
Contrail to Distrail Contrail Simulations Why do some planes leave long trails, but others don’t?
WWII Contrails – A large collection of photos showing persisting and spreading contrails from WWII in the 1940s.
Pre WWII Contrails – The History of contrails dating back to 1918, with the first persistent spreading contrail observed in 1921 Some more WWII Contrails – A WWII contrail photo I found in an old photo album uploaded to Flickr.