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The familiar sounds of your heart are made by the heart's valves as they open and close.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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 500,000 babies are born each year in the United States to teenage mothers.