IN THE DECADE since researchers first sequenced the human genome, obvious links between the genes and individual diseases have been slow to appear [see “Revolution Postponed,” by Stephen S. Hall; Scientific American, October]. Many researchers now believe that real advances in genomics will come not from simple X-causes-Y correlations but from a rich statistical understanding that emerges out of the sequences of millions of genomes—a set that reveals how our genetic code is likely to interact with the environment to make us who we are.