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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 inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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The human body produces and destroys 15 million blood cells every second.

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