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There are 60,000 miles of blood vessels in every adult human.
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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.