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The familiar sounds of your heart are made by the heart's valves as they open and close.
An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.