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Did you know?
The longest a person has survived after a heart transplant is 24 years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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There are approximately 3 million unintended pregnancies in the United States each year.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.