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Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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There are 60,000 miles of blood vessels in every adult human.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.