The white lines seen following airplanes as they fly could be full of harmful chemicals that are toxic in Americans' health, some people claim.
The streaks left across the sky from planes, called contrails, are formed by water vapor from the plane's exhaust freezing in the cold air at high altitudes.
However, conspiracy theorists, as well as some politicians, believe some trails that linger longer than usual actually contain toxins, referring to these as 'chemtrails.'
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