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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.