Only humans shed emotional tears.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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Touching a teddy bear can make people feel less lonely.
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On average, someone in the US suffers a stroke every 40 seconds; someone dies every 3 minutes from stroke.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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