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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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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.