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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The longest a person has survived after a heart transplant is 24 years.
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The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.