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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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Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.