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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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.