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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Illicit drug use costs the United States approximately $181 billion every year.

