Siberian 'eagle's nest' continues to baffle scientists: Theories of how 250-year-old mound formed range from a meteorite strike to a nuclear blast

Siberian 'eagle's nest' continues to baffle scientists: Theories of how 250-year-old mound formed range from a meteorite strike to a nuclear blast | Mail Online: "When one geologist stumbled across a massive mound 65 years ago, he had no idea his discovery would spark one of the world’s strangest scientific mysteries."