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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.