Researchers looked at 830-million-year-old halite and found microorganisms that may still be alive. - USA TODAY

Figuring out whether the microorganisms are still alive and how they've survived this long is the tricky part.

• Scientists analyzed halite samples from 830 million years ago using optical techniques.
• Inside the samples, they found microorganisms such as bacteria, algae and fungi that may still … [+5596 chars]
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