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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.