If you're not familiar with the chemtrail conspiracy theory, let me fill you in real quick. The thin, wispy clouds left behind by high-flying aircraft are known as contrails, short for condensation trails. These clouds are left behind as a result of the warm, moist exhaust of the plane's engines meeting the extremely cold temperatures of the upper atmosphere. It's a similar principle behind why you can see your breath on cold mornings.

Contrails appear and disappear based on the moisture content of the air through which the plane is passing. If the upper atmospheric air is moist, the plane will leave a contrail that could last hours and spread out into a deck of cirrus. If the air is extremely dry, it might not leave a contrail at all.

Since about the mid-1990s, there's a subset of people who believe that these contrails are really chemtrails, or trails of vaporized chemicals being sprayed into the atmosphere by aircraft that are really flying around with with tanks full of chemicals rather than passengers. These alleged chemtrails are the work of any number of groups: governments, companies, Jews, you name it. The ultimate goal differs depending on whom you ask, but the two biggest strains of thought are that the chemtrails exist to control the weather or make the populace sick.

For most people with a basic level of science education, the idea is absurd, but the conspiracy theorists truly believe that these chemicals are being sprayed to control the weather, make the population sick, or partake in other "geoengineering" activities.

The Challenger left a chemtrail.....oh wait

Sometimes after a good, wet burrito, I tend to leave chemtrails.
People behind me start choking. I've heard them.

Only thing that is even close to reality as far as I'm concerned is maybe cloud seeding. Differing air currents at different altitudes would make chemtrails a real crap shoot at best. Tough to guarantee delivery

Are these US Patents real?..............4686605........5003186..........