Did you know?
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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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
A typical variable cam timing control valve. The solenoid is controlled by the engine computer and ...
Typical injuries of an unrestrained driver.
Rod Stewart - Some Guys Have All the Luck (Official Video)
Presidential success under unified and divided government, from Eisenhower to trump
Chromatin readers, writers, and erasers