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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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.
The longest a person has survived after a heart transplant is 24 years.
Blood is approximately twice as thick as water because of the cells and other components found in it.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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