Readers reply: why do humans cry when they are sad?, Biology

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Here's How to Cry the Right Way to Relieve Stress and Anxiety - WSJ

Have No Fear, Shed A Tear: the Evolutionary Significance of Crying

Simply Stated: Why Do We Cry When We're Sad?

We need to talk about crying at work, by Jonathon Colman

My Quest for Sadness - The New York Times

Historians dispel the 'boys don't cry' myth on Reddit - Upworthy

Humans Are the Only Animals That Cry — And We Don't Know Why

Why Do We Cry? - The Science of Crying - Geekswipe

What is the biological advantage of crying when emotional?

Why Do We Cry? - The Science of Crying - Geekswipe

Why Do We Cry? 6 Practical Explanations

Can dogs cry? What's the meaning behind those teary puppy eyes

What is the simplest trick to make a reader cry? - Quora

Is crying healthy? - Quora