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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Excessive alcohol use costs the country approximately $235 billion every year.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.