HowStuffWorks takes a look into the mystery of crop circles -- what they are, ... such as a fungus that attacks the crops and causes their stems to bend over, or it is ... science.howstuffworks.com
Archeological remains can cause cropmarks in the fields, in the shapes of circles and squares, but they don't appear overnight and they are always in the same ... en.wikipedia.org
A group of pranksters tied boards to their feet and made designs with them in fields. Then confessed the hoax...and people refused to believe it. Sigh. answers.yahoo.com
Some of these are surely caused by wind or rain, careless hoaxers or the trampling feet of crop circle buffs. But let's set those aside and look only at those that ... www.lhup.edu
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