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When you're considering a system you don't understand well, it's very error prone to try to exhaustively list everything that is possible. And eliminating a given impossibility is always probabilistic. The probabilities multiply
Based on meta observations about the study itself, with no knowledge of Venus or chemistry, I would bet against the conclusion that this is life
Makes for a good headline, though, and that's generally what matters most
Science could use better PR. These kinda headlines just give wrong impression to lay people. A more appropriate headline may be “scientist found gas that may suggest microbial life”
I would bet against it too since the odds seem pretty low. But, it would be one of those situations where I would be happy to be wrong.
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