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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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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Blood is approximately twice as thick as water because of the cells and other components found in it.