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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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![The slight (5 microsecond) difference in the firing of the companion cylinders is enough time to ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_6_52_55_298211569.png)