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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

A sod house in North Dakota, 1896. Individual “bricks” of sod were hewn from the ground and stacked A sod house in North Dakota, 1896. Individual “bricks” of sod were hewn from the ground and stacked
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Josiah Wedgwood, Queen's Ware dinner service (detail). Josiah Wedgwood, Queen's Ware dinner service (detail).
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