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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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People about to have surgery must tell their health care providers about all supplements they take.
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Vaccines prevent between 2.5 and 4 million deaths every year.