Category: ears...

someone who can wiggle their ears by contracting their scalp
keeping your eyes and ears open
the invisible vibrations called sound waves channeled into the auditory canal causing the eardrum and ossicles to vibrate; the vibrations traveling through fluid and hair cells to be converted into nerve impulses carried to the brain
hearing most clearly when the air pressure of the middle ear is the same as the air pressure outside your body
the human ear maintaining our sense of balance (equilibrium) and coordination of head and eye movements
ear wax, there to discourage insects from entering
the human ear being most sensitive to frequencies of 1000-4000 hertz, though young ears can hear 20-20,000 hertz
only when the nerve impulses reach the primary auditory area of the cerebral cortex does the listener become aware of the sound
Honest advice is unpleasant to the ears. (Chinese proverb)
You cannot reason with a hungry belly, it has no ears. (Greek proverb)
A man falls in love through his eyes, a woman through her ears. (W. Wyatt)
Fluid in the semicircular canals is swirled by head movements, sending messages to your brain about the body's position. Then you adjust the rest of your body, to balance.
Ears can detect 1,500 different tones and 350 degrees of loudness.