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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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Everyone has one nostril that is larger than the other.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.