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Vaccines prevent between 2.5 and 4 million deaths every year.
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The horizontal fraction bar was introduced by the Arabs.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.