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The familiar sounds of your heart are made by the heart's valves as they open and close.
According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
Approximately 25% of all reported medication errors result from some kind of name confusion.