The originator of the doctrine that our observations of the Universe are biased because they are made by us now concludes that there have been at most two critical steps in biological evolution.
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Maddox, J. New twist for anthropic principle. Nature 307, 409 (1984). https://doi.org/10.1038/307409a0
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DOI: https://doi.org/10.1038/307409a0