Crop circles have appeared for a long time, and there are few people who have never heard about the phenomenon. Many people have very explicit opinions about crop circles, but hardly anyone is aware of what they truly are. Few people know, for example, that writtings from the 18th century already mentioned the appearance of crop circles in Europe.
Crop circles appear in any type of field and sometimes not in a field at all (like in snow) but nobody knows how they are made.
Crop circles are usually assigned to the creativity of pranksters who flatten the crop with tools. And there are people who do this. Hardly anyone knows that this guess can not explain many well-documented characteristics of crop circles.
Another phenomenon, closely related to crop circles, is the appearance of flying "balls of light", in and around the formations. Some witnesses claim that these 'balls of light' actually create the crop circles. Few people know, however, that these "balls of light" leave very real physical traces, in the form of dehydrated plant stems or perfectly circular burn marks on metal and wooden surfaces.