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Your co-worker's crummy day
A stressful day for your office mate may rub off on you, according to research from the journal Social Neuroscience. The study shows that even simply seeing an anxious person ups your stress hormones. "To protect yourself, take steps before and after you interact with a stressed-out person," says Elizabeth Lombardo, PhD, a Chicago-based psychologist. When you have to deal with a stressed coworker, tell yourself, "I choose not to absorb her stress." Afterward take a few deep breaths to calm yourself before going back to work.

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