No one knows exactly why humans produce tears of laughter, joy, and sorrow. There are many different types of tears, but emotional tearing is thought to be unique to humans .
Although other animals shed tears, there has only been anecdotal evidence for emotional tearing in species other than human beings. Scientifically, since animals can't speak, it's difficult to tell whether an animal is crying emotionally, or simply producing tears for the purpose of lubrication, or due to irritation.
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