The environment in which one develops before and soon after birth provides powerful experiences that chemically modify certain genes in ways that then define how much and when they are expressed. Thus, while genetic factors exert potent influences on human development, environmental factors have the ability to alter family inheritance. ~developingchild.harvard.edu/resources
“If our hopes of building a better and safer world are to become more than wishful thinking, we will need the engagement of volunteers more than ever.”