A Harvard team have successfully encoded, using the 4 bases, an old cine sequence of a galloping horse into the DNA of a bacterium and replayed it (https://www.theguardian.com/science/2017/jul/12/scientists-pioneer-a-new-revolution-in-biology-by-embeding-film-on-dna). This may sound like a gimmick but the intention is to demonstrate that one can produce molecular recorders that could be used to establish what is going on in the organs of the body or to monitor environmental changes. If humans manage to extinct themselves, it would be interesting to see what alien explorers make of such data.
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