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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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On average, the stomach produces 2 L of hydrochloric acid per day.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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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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