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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.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.


