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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.