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ciphergoth comments on Open Thread: March 2010 - Less Wrong
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So finding evidence of life that went extinct at any stage whatsoever should make us revise our beliefs about the Great Filter in the same direction? Doesn't this violate conservation of expected evidence?
Is there a counter-weighing bit of evidence every time we don't find evidence of life at all, and every time (if ever) we find evidence of non-extinct life?
According to Hanson's article, non-extinct life that didn't reach sentience counts as failing the Great Filter, and no life at all also counts as failing at a very early stage. I believe my point still stands.