Modern Engineering Marvels on MSN
Deep in Mammoth Cave, shark teeth rebuild a lost tropical sea
The longest mapped network of caves in the world also contains one of the most implausible marine collections in North America. In Mammoth Cave, sharks and their kinsmen are preserved in layers of ...
Morning Overview on MSN
Scientists uncover 2 terrifying extinct predators in world’s longest cave
Deep inside the world’s longest cave system, scientists have uncovered two terrifying extinct predators that once prowled a ...
Mammoth Cave National Park, home to the world’s longest known cave system, stretches for more than 680 kilometres, and ...
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