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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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