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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Excessive alcohol use costs the country approximately $235 billion every year.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.