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…From the point of view of rational analysis the weight of evidence is still on the side of the skeptics who assure us that all crop circles are made by artists and lovable, jolly old men like Doug and Dave. But there are facts that don’t quite fit, and the alternatives are worth considering. They lead into very disturbing areas, not all of which have to do with physics. In a concluding (fourth) post, I plan to come back to the initial issue raised by the crop circle problem, which is that of the construction and manipulation of belief systems.