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Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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There are approximately 3 million unintended pregnancies in the United States each year.
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There are 20 feet of blood vessels in each square inch of human skin.