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What is a “Contrail?”

Posted on: January 14th, 2012 by
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contrail is a series of clues that lead the police to catch a criminal.
Actually, that's not the only answer.  Contrails are the trails behind aircraft that look like smoke but are really just water vapour.  Here's a post I made on the topic on the excellent Continue reading the story "What is a “Contrail?”"