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There are 60,000 miles of blood vessels in every adult human.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

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When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

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The horizontal fraction bar was introduced by the Arabs.

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