Until now, Scientists are still confused about the exact cause why humans cry and tear. At the beginning of the study, researchers found that humans can cry was colored by the incidence of pressure within them. you must know like when someone is having a complicated problem, difficult to express let alone solved. until finally yes tears that flow.
But often when researchers begin to realize the human crying tears it shows that there is a problem. another case with baby. Babies cry more often than not being sick or again there is a complicated problem. If you find a crying baby it is because the baby is in need of attention. Usually the attention of his parents.
In addition, crying also has other causes and functions as an attempt to express guilt or a tool used to save a relationship. Usually a relationship in romance.