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In the Silver State, where long desert highways connect vibrant cities like Las Vegas and Reno, questions about personal habits behind the wheel are common

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The term epigenetics refers to the changes that can occur to the DNA without affecting the underlying sequence of the DNA

Even carbon dioxide can have significant health impacts

Here, age is our confounding factor, because older people are more likely to be inactive (called exposure), and this as well is associated with the outcome (because older people are at greater risk of developing heart disease)

Content last reviewed December 2012