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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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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.