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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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There are more bacteria in your mouth than there are people in the world.
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Vaccines prevent between 2.5 and 4 million deaths every year.