In 2011, Marine biologists created a baffling discovery—in excess of 1,300 nearly fantastic circles scattered through the Mediterranean Sea floor off the coast of Corsica. These formations, some 67 feet broad, sparked many theories: ended up they volcanic craters, WWII bomb scars, or a little something even stranger? In https://medium.com/@perfectseoservice2017/the-thriller-of-one-three-hundred-best-circles-on-the-mediterranean-seafloor-science-unveils-the-f6327a72d07b