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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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There are 60,000 miles of blood vessels in every adult human.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.