That pain you feel listening to complainers? It's real enough to peel away neurons from your brain and render it pretty much useless, reports Inc. "The brain works more like a muscle than we thought," says Trevor Blake, an entrepreneur who wrote Three Simple Steps: A Map to Success in Business and Life. "So if you're pinned in a corner for too long listening to someone being negative, you're more likely to behave that way as well." But he offers tips for coping: