For years, strange underwater circular formations in the Baltic Sea have mystified residents. Some have thought that they were bomb craters, or created by fairies or aliens. Turns out, none of the above explanations is correct.
"It has nothing to do with either bomb craters or landing marks for aliens," said biologists Marianne Holmer from University of Southern Denmark and Jens Borum from University of Copenhagen in a statement. "Nor with fairies, who in the old days got the blame for similar phenomena on land, the fairy rings in lawns being a well known example."
Read > The Scientific Explanation Behind Underwater 'Fairy Circles'