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The longest a person has survived after a heart transplant is 24 years.
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The average adult has about 21 square feet of skin.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.