Crop circles
Crop circles are fields where some circles have been flattened. In many cases these circles are considered has hoaxes.
At the beginning crop circles where has been attributed to outside of earth, some people says that people coming from space are coming every years to flatten circles.
In fact we know circles are flatten by human every year, in many case this phenomenon takes place in United Kingdom but we can see it all around the world.
People who do crop circles just draw plans and after they go on the area selected with a piece of wood and rope. They put the wood on the center of the area, fix the rope and turn around the wood flattening the grass following the plan.
It is like a pair of compass drawing.
Very easy yo do, some crop circles are much harder to make.
In many cases it is very easy to proof that crop circles are doing by humans but not by extraterrestrial life. But in a few a doubt exist.
