Only humans shed emotional tears.
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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."
20
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
In 2006, a woman was found in her London flat, skeletonized, after 3 years of being dead – with the TV still running.
23
Touching a teddy bear can make people feel less lonely.
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