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Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Asthma cases in Americans are about 75% higher today than they were in 1980.