Those long, slender, man-made clouds left by jet aeroplanes flying overhead are known as condensation trails, which form as a result of the warm, moist exhaust of the plane’s engines meeting freezing temperatures at high altitudes.

However, since the middle of the 1990s, some people have believed that these vapour trails are actually chemical trails, or more popularly known as “chemtrails” being sprayed by nefarious people to control either the weather or the population.

Depending on which chemtrail believer you talk to, the people behind the spraying are affiliated with some corporation or some country’s governments.