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Meteor strike? UFOs? Whatever created these isolated ponds and wetlands left a wondrous ecosystem that is in dire need of protection.

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What Caused the Mysterious Carolina Bays? — Plus Other Natural Mysteries
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    France's Mysterious Fosse Dionne Spring Stubbornly Keeps Its Secrets

    France's Mysterious Fosse Dionne Spring Stubbornly Keeps Its Secrets

    Key Takeaways The Fosse Dionne spring in Tonnerre, France, remains a mysterious natural wonder, with its source having never been identified. • This …

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