National Sourpuss Day --

Don't bother telling a grouch to cheer up, he was born that way. A study conducted by psychologist Dr. David Zald, of Vanderbilt University in Nashville reveals that grumpy people's brains are wired to make them more cantankerous than others. The villain is a postage stamp-size portion of the brain about an inch or two behind the right eye called the ventromedial prefrontal cortex. The more activity in that area, the more likely a person is to be a sourpuss. "It looks like it's this part of the brain's activity that regulates people's moods," Zald explains. "It's also a part of the brain that controls sweating, stomach acidity, heart rate and other physical feelings associated with stress and bad moods.

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