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The horizontal fraction bar was introduced by the Arabs.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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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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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.