Microbes that may be between 10,000 and 50,000 years old have been revived from the inside of enormous, glittering crystals from a Mexican cave. This chamber is filled with selenite crystals many meters long that formed over hundreds of thousands of years in magma-heated, mineral-rich groundwater. "What we have been finding are organisms whose closest relatives are also from extreme environments around the world," said study leader Penelope Boston, director of NASA's Astrobiology Institute.
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