Indulge me as I digress from writing about health this week to write about an important scientific breakthrough. People have been altering the living things around us as long as we have been around.  We domesticated wild wolves into tame dogs and kept them for protection and as pets.  Eventually humans began to farm, and raise livestock.  We then began selecting the best animals to breed for the next generation, and we selected seeds from the best plants to sow.  Generation after generation, we...