In the abstract, it might be tempting to imagine that irredu... - Michael J. Behe, Darwin's Black Box: The Biochemical Challenge to Evolution

"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."