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There have been recent studies showing that our DNA changes in response to stress. That DNA is inherited by descendants even though the stress has changed.
Basically, evolution.
By stress I don't mean a tough day at work, but any type of stress put upon a person. Hunger, learning, emergencies and so forth.
It is probably true about other human experiences but I don't think that's been studied, but it stands to reason. We need to think of DNA as "a living document" not something cast in stone.
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