What is Tears?
Tears are the liquid product of crying to clean and lubricate the eyes.
The word lacrimation(from L.Lacrima meaning Tear)(also spelled lachrymation) may also be used in a medical or literary to refer to crying.
Strong emotions,such sorrow or elation,may lead to crying.
The Process of yawning may also result in lacrimation.
Although mast land mammals have a lacrimation system to keep their eyes moist,human are the only mammal generally accepted to cry emotional tears.(from Wikipedia)
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