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Did you know?
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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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There are 20 feet of blood vessels in each square inch of human skin.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.