When people are sad, tears sometimes follow. Crying is an expression of a feeling. We can also associate tears with laughter. It can be confusing how two emotions completely opposite could produce the same physical response.   Researchers from Yale University conducted a research looking for a better understanding of this response. Their research findings “that feeling “too positive” can interfere with decision making and cause people to neglect environmental threats and act impulsively.” Since our brain is always on the alert to keep us safe, there is some merit to this conclusion. click for more