Creatures that thrive on iron, sulfur, and other chemicals have been found trapped inside giant crystals deep in a Mexican cave. The microbial life-forms are most likely new to science, and if the researchers who found them are correct, the organisms are still active even though they have been slumbering for tens of thousands of years.

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Microbial life on Earth may be able to endure harsher conditions than scientists thought possible on.natgeo.com/2m5ltqL

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National Geographic (@NatGeo) February 17, 2017