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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.