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There are 60,000 miles of blood vessels in every adult human.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Illicit drug use costs the United States approximately $181 billion every year.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.