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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The horizontal fraction bar was introduced by the Arabs.
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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.