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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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