The document, in Italian version, resume some historical information, starting from XVII centuries, related to documents treating the phenomena of Crop Circles.
The sufficient number of crop circles analysis, have given the possibility to identify a series of typical characteristics of crops listed there.
One hypothesis on possible solution of this mystery, consisting on possible action of circular electromagnetic field on the base of grain stem, is reported.
Who have done that, remain a mystery!
A. Magenta, C. Malanga
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