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Did you know?
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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The longest a person has survived after a heart transplant is 24 years.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, the stomach produces 2 L of hydrochloric acid per day.