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A lot of us think of our genes as sort of this immutable force. We’re born with our DNA, and it doesn’t change. But genes can be turned on or off. Or they can even be turned up or down, so they work with the intensity of a spotlight, or the dimness of a candle. We learn why some scientists think our environment can activate this system and affect our genes.
Ask reporter Lynette Kalsnes about this story, and the DNA Files series, at our Forum.
  
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