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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.