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2-bn-year-old rock harbors living microbes, rewrites life's history
(interestingengineering.com)
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2024-11-11
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5912235/
tl;dr: "DNA staining" means they use something that reacts with DNA to indicate its presence. So if you paint the rock and it turns purple, you know where to look for DNA.