Since the eighteenth century, the world has been fascinated by the nocturnal phenomenon of crop circles – strange, inexplicable patterns appearing in farmer’s fields overnight. Explanations for these occurrences have included everything from cyclonic wind action to alien interference.
As yet no conclusive evidence has been found for any of these theories, which have been criticized as pseudoscientific by skeptical groups like the Committee for Skeptical Inquiry.
In his 1997 book The Demon-Haunted World: Science as a Candle in the Dark, Carl Sagan discussed alien-based theories of crop circle formation. Sagan concluded that no empirical evidence existed to link UFOs with crop circles.
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