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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.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The human body produces and destroys 15 million blood cells every second.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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