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The word "chemtrails" is a knock off of the word "contrails." Contrails are trails of condensation that can be seen in the sky when a jet airplane is traveling at above 30,000 feet altitude. Up there, almost 6 miles high, the air is thinner and colder -- very cold. Outside temperatures can dip to minus 60 F and the air is often full of minute ice crystals that hang suspended and invisible. When these ice crystals get sucked into a hot jet engine they turn into a gas, like steam, and can be seen as puffy white cloud-like lines that follow behind the jets. They usually dissipate and fade away as the moisture once again returns to form invisible ice crystals. "Chemtrails" are something different. They are often formed behind jet aircraft at a much lower altitude and seem to persist in the sky. They often have a different color from contrails and frequently exhibit a rainbow spectrum if lit just right from the sun. The confusion between these two kinds of phenomenon is what made us hesitate to write about them in Viewzone. We figured that with the dramatic increase in air transportation ther would naturally be many more contrails in the sky and that worrying about this was just another form of modern paranoia.