The human relevance of tears: 'We cry because we need other people

It’s not only sadness or grief that makes us cry, but many other feelings as well, including empathy, surprise and anger, psychologist Ad Vingerhoets points out.

8 Reasons Why We Cry

Why do we cry? The science of tears, The Independent, tears

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Why We Cry and What It Can Teach Us

Do Other Animals Cry and More Questions From Our Readers, At the Smithsonian

Sniffing Women's Tears Makes Men Less Aggressive

What are Tears Made of?

The Wonderful, Transcendent Life of an Odd-Nosed Monkey, monkey

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Why Do We Cry? Scientific American