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2-bn-year-old rock harbors living microbes, rewrites life's history
(interestingengineering.com)
this post was submitted on 08 Oct 2024
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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.