Epigenetics is a very young science, it has only been studied seriously in the last 20 odd years.

Dr Bruce Lipton is one of the major pioneers of this science and I love the way he explains it and how it has personally transformed his life.  Here is a video of Bruce at a conference last year discussing it and the implications for our health and happiness.  We are no longer at the mercy of our genes and that can only be a good thing.