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Did you know?
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 longest a person has survived after a heart transplant is 24 years.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are 60,000 miles of blood vessels in every adult human.