Recently, scientists have become convinced that there is a form of inheritance, called epigenetic inheritance, in which the behavior of genes in offspring is affected by the life experience of parents. Furthermore, these epigenetic changes can, at least for a small minority of genes, extend beyond immediate offspring to further generations, although (at this point) the effects do not appear to last indefinitely. There is also the possibility that epigenetic inheritance is implicated in the passing down of certain cultural, personality or even psychiatric traits. For instance, historical "insults," such as Oliver Cromwell's brutal reconquest of Ireland in 1649, have led to an "embedding" of attitudes within the affected communities that persist for generations. (Hunter, Phillip. What Genes Remember.) (http://philoscience.unibe.ch/documents/TexteHS09/genes_remember.pdf)

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