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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.