Post-nasal drip occurs when excess mucus accumulates in the back of the throat or nose, primarily due to allergies, infections, or irritants. Symptoms include throat clearing and coughing.

A Brillouin spectroscopy study of the apple fruit cuticle indicates spatial micro-mechanical inhomogeneities exist between the periclinal and anticlinal regions.

Yellow or green discharge (pus) in the eye The eyelids are stuck (matted) together with pus after sleep After being wiped away, the pus comes back during the day Often caused by a bacterial eye ...