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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.
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There are 20 feet of blood vessels in each square inch of human skin.