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Did you know?
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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.