There are 3 types of tears: Emotional tears, basal tears and reflex tears, and each kind of the salty water in your eyes has a different purpose.
The Microscopic Structures of Dried Human Tears
Psychology/physiology behind why bottling up emotions leads to outburst? - Quora
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Why do we cry – and what can we learn from our tears?, Health & wellbeing, tears
Why Do We Cry?, The Science of Crying
The Composition of Tears and Their Role in Eye Health
Our tears contain natural pain killers to help us cope., tears
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What Are Tears Made Of and Why Do We Cry?, tears
Why do we cry?
What Are Tears Made Of and Why Do We Cry?
Psychology/physiology behind why bottling up emotions leads to outburst? - Quora
Opinion Tears Teacher - The New York Times, tears
The Role of Tears - Seema Eye Care Center, tears
Tears, a Brief Overview of a Tiny Hidden System Inside Your Body