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Vaccines prevent between 2.5 and 4 million deaths every year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.