Thanks to the publicity surrounding the human genome project, most of us think we know something about genetics. However, genetic science, like nutritional science, is still in its infancy. Until recently, for example, we used to think of genes as set in stone. You either had good genes or bad genes, and they determined whether or not you would get breast cancer, have crooked teeth, or get an astigmatism in your middle age. Modern genetic research has shown us otherwise. It turns out these things are more heavily influenced by nutrition — yours, your parents’, and your grandparents’.