Diane Fradkin

Curious how we can always explain what makes a pedigree work once a horse has shown he can actually run. They call it "ex post rationalization" or sometimes "hindsight bias". Working backward from a high-functioning racehorse, you isolate whatever elements of the page flatter your prejudices and methodology, and triumphantly announce that you have found the key to the genetic engine. You could, of course, perform pretty much the same exercise with countless slow horses whose antecedents contain equally plausible elements. Funnily enough, however, we don't bother doing that quite...