Among the myriad of actions performed exclusively by humans, crying appears to be the most enigmatic. While no other animals are known to cry, humans shed emotional tears from birth throughout life.

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Humans appear to be the only species clearly proven to shed tears specifically because of emotions. Elephants, primates, and dogs show behaviors and biological responses that come closest to human ...

Crying is one of the most recognizable human emotional signals. Tears appear when people experience grief, relief, joy, or deep stress. Because this response is so familiar, observers often assume ...