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CellBioGuy comments on Astrobiology III: Why Earth? - Less Wrong
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Have you ever seen this paper that claims a complexity analysis of the Viking lander experiment results can't be explained by chemistry alone? Interesting stuff...
https://www.researchgate.net/publication/257958533_Complexity_Analysis_of_the_Viking_Labeled_Release_Experiments
Now I have!
I think their case is weak but it is something to continue to be considered when analyzing any new data. There's weird soil chemistry there for sure, a good deal of which might be explicable from the interaction between perclorate and small amounts of organics, but the amount of data is tiny and I would not rule out soil microbes. A lot more work has to be done before you can say much with confidence.