An April 18 Facebook post (direct link, archive link) shows a video of a plane trailed by a wide plume of white smoke. "They're spraying us," read the post. "Those are not contrails! I was born in the ...

I looked out the window this morning to see this amazing set of contrails. Contrails are the narrow ribbons of cloud that form behind high-flying aircraft. They’re a frequent sight if you live under a ...