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In the future, can we get DNA tests as children to find out what types of diets to eat and what kinds of medicine to take? If only it was that easy. A new study suggests that, for most common diseases, genes alone only tell part of the story–and the environment tells the rest of it, because it interacts with DNA in ways that are difficult to predict. Geneticist Barak Cohen says, "Having a particular genetic variant may not have much of an effect but combined with a person’s environment, it may have a huge effect."
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Your neighborhood may be gaily decorated, with Christmas lights on every house, but is it a healthy place to live? Not if there’s a Meth lab nearby!

When authorities discover a “meth house,” they decontaminate it by removing chemicals, getting rid of carpeting, cleaning walls, and airing the place out for a few days. Researcher Glenn Morrison says, “Most people who live in a former meth house don’t even know it, and some hotel rooms have also been contaminated” (so much for for taking the relatives to the local hotel for the holidays).
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