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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.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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The average adult has about 21 square feet of skin.

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