Why do we cry, and why does our nose run when we are sad? What’s the explanation behind it?
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Firstly, emotional tears are *not* the same as irritation tears chemically. In theory if you sampled a tear drop you would see different chemicals in it and would be know if it’s because the person is sad, or because the person has sand in their eye.
Secondly, emotional tears achieve two things. We know that releasing emotional tears is directly related to the production of various brain-chemicals and feelings of relief and pleasure. This is why “having a good cry” is a thing. Crying emotionally actually makes you happier. Secondly, humans evolved as a social species before we had language, and our faces are a primary source of knowledge of our peers. *You* don’t just cry, but *other people* see you cry and learn from that. They learn you’re upset, you’re in a mood and their knowing this, somehow, proved beneficial to our survival as a species. Hence, the trait was passed along.
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