In 2011, Marine biologists produced a baffling discovery—about one,three hundred approximately ideal circles scattered throughout the Mediterranean Sea flooring off the coast of Corsica. These formations, some 67 toes wide, sparked a great number of theories: have been they volcanic craters, WWII bomb scars, or a thing even stranger? https://medium.com/@perfectseoservice2017/the-thriller-of-one-three-hundred-best-circles-on-the-mediterranean-seafloor-science-unveils-the-f6327a72d07b