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Did you know?
The longest a person has survived after a heart transplant is 24 years.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.