I happened across a PBS broadcast last night that seemed timely.
Nova Science Now had a segment on epigenetics. I missed the beginning, but apparently there are chemical messengers that act as the "operating system" to our DNA's "hardware." Environmental factors can have a significant, lasting impact on those messengers, with the effects showing up even in future generations.
I want to watch the segment again -- it's available at the link below, possibly only through July.
http://www.pbs.org/wgbh/nova/sciencenow/3411/02.html
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