The Ghost in Your Genes - BBC Horizon

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Biology stands on the brink of a shift in the understanding of inheritance. The discovery of epigenetics -- hidden influences upon the genes -- could affect every aspect of our lives.

At the heart of this new field is a simple but contentious idea -- that genes have a 'memory'. That the lives of your grandparents -- the air they breathed, the food they ate, even the things they saw -- can directly affect you, decades later, despite your never experiencing these things yourself. And that what you do in your lifetime could in turn affect your grandchildren. (www.youtube.com)