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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.