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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Everyone has one nostril that is larger than the other.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.