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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.