In a way, sequencing DNA is very simple: There's a molecule, you look at it, and you write down what you find. You'd think it would be easy—and, for any one letter in the sequence, it is. The problem ...
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How long does DNA last?
Scientists have been using ancient DNA to investigate questions about extinct animals since 1984, when researchers recovered two pieces of DNA from a museum specimen of a quagga, a zebra-like species ...
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