"...looking angrily at the wombat: and a moment later, 'Come now, Stephen, this is coming it pretty high: your brute is eating my hat.' 'So he is, too,' said Dr. Maturin. 'But do not be perturbed, Jack; it will do him no harm, at all. His digestive processes--"

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In the abstract, it might be tempting to imagine that irreducible complexity simply requires multiple simultaneous mutations - that evolution might be far chancier than we thought, but still possible. Such an appeal to brute luck can never be refuted... Luck is metaphysical speculation; scientific explanations invoke causes.

— Michael Behe