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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.