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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Green tea is able to stop the scent of garlic or onion from causing bad breath.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.