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There are 20 feet of blood vessels in each square inch of human skin.
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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.