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.
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
On average, someone in the US suffers a stroke every 40 seconds; someone dies every 3 minutes from stroke.
In 2006, a woman was found in her London flat, skeletonized, after 3 years of being dead – with the TV still running.
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.