This funded study has examined the soil around some crop circles and found them to be radioactive The Discovery of Thirteen Short-Lived Radionuclides
in Soil Samples from an English Crop Circle. Okay, so most crop circles are hoaxes, but hoaxers wouldn't leave radiation behind would they?
in Soil Samples from an English Crop Circle. Okay, so most crop circles are hoaxes, but hoaxers wouldn't leave radiation behind would they?