If irreducible complexity is a reality, a portion of evolution is inexplicable in Darwinian (or any other natural) terms. (Dr. Behe doesn???t deny that most evolution proceeds naturally, nor does he doubt that life is a billion or so years old or that human beings descend ultimately from protozoa.) To get past the non-Darwinian roadblocks, one has little choice but to posit what we may as well cal