What is a "chemtrail," exactly? Experts agree that jet contrails are harmless, yet thousands of people think the vapors are evidence for anything from massive drug dosing to weather wars. Why? Learn more about the conspiracy theories surrounding chemtrails in this episode of Stuff They Don't Want You To Know. http://howstuffworks.com http://facebook.com/ConspiracyStuff http://twitter.com/conspiracystuff http://itunes.apple.com/us/podcast/stuff-they-dont-want-you-to/
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