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There are 20 feet of blood vessels in each square inch of human skin.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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.
Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.