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Excessive alcohol use costs the country approximately $235 billion every year.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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The average office desk has 400 times more bacteria on it than a toilet.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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The horizontal fraction bar was introduced by the Arabs.

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Video: Ionic bonds - role of ions in the body

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