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Crop circles are patterns created by flattened crops such as wheat or barley. They have been observed since the late 17th century, but became prominent in the late 20th century in England. The phenomenon remains controversial, with debates over whether they are hoaxes or have paranormal explanations. Some key points in the debate include unexplained effects on plants inside circles, such as elongated nodes and cell wall changes. While some are admitted hoaxes, others display features like heated plant stems that have not been replicated human experiments. The origins and purpose of at least some crop circles remain unknown.Read less