Chances are high that your smartphone is within reach as you read this. You'll probably check it before you finish the article, maybe because Facebook has sent you a notification, or because your anxiety about missing one has caused you to feel a "phantom vibration" in your pocket, or just because you're bored. (Sorry.)
You might feel that you're being efficient - reading an informative story and keeping up with your social network at the same time. But research increasingly shows this approach is counterproductive.
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