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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.