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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Illicit drug use costs the United States approximately $181 billion every year.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

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