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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Asthma cases in Americans are about 75% higher today than they were in 1980.