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Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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 childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.