Why Your DNA Isn't Your Destiny

This is a really great TIME article that describes the basics of epigenetics as well as detailing the development of the theory of epigenetics as well as some key experiments in the field.  It especially details Bygren of Stolkholm's paper of the effect of starvation periods on lifespans of an individual's grandchildren.  It also describes a study of the effect of men smoking before puberty on their offspring.