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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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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 cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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