Smiling Reduces Aggression

As revealed by a study out of the University of Bristol in England, seeing a smile can help reduce aggression in others. "The results of our experiments strongly suggest that biases in the perception of emotional facial expressions play a causal role in subjective anger and aggressive behavior," the study authors noted. This means that just by witnessing a smile, a person about to perform an act of aggression was more likely to stop this emotion in its tracks.