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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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The longest a person has survived after a heart transplant is 24 years.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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On average, the stomach produces 2 L of hydrochloric acid per day.