CorrectionsOpinion Sep 30, 2009

In our Aug. 27 issue, we erroneously reported that ontogeny recapitulates phylogeny. In actual fact, while superficial similarities between a species' stages of embryonic development and the adult stages of that species' distant ancestors may exist, said similarities are subjective and cannot be classified as functionally equivalent in any meaningful biological sense. The Onion regrets the error.