New born babies do not shed tears when they cry.  They have enough moisture to protect their eyes, but tears appear several weeks after their tear ducts have developed fully.

Surveys estimate that 85 percent of women and 73 percent of men reported feeling well after crying.
There are three different types of tears
·    Basal tears
·    Reflex tears
·    Emotional tears.

Basal tears - Tear glands constantly produce this clear liquid to protect and lubricate our eyes.  It also improves our eye sight.  When we blink this fluid is spread over our eye.

Reflex tears -    These tear flood our eyes when an irritating substance of particle gets into them. Reflex tears are associated with actions as varied as yawning and laughing.

Emotional tears  -    These are the “human” tears that we shed when we feel a strong emotion.  They contain  24% higher protein that reflex tears.