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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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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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Excessive alcohol use costs the country approximately $235 billion every year.