The science behind human tears reveals a fascinating interplay of biology, psychology, and evolution, explaining why we cry and how tears benefit us. Tears are produced by the lacrimal glands, located above the outer corner of each eye, and come in three types: basal (lubricating the eye), reflex (triggered by irritants like onion vapors), and emotional (tied to feelings like sadness or joy). Emotional tears contain stress hormones such as cortisol and prolactin, along with leucine-enkephalin, a