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Blood is approximately twice as thick as water because of the cells and other components found in it.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Medication errors are more common among seriously ill patients than with those with minor conditions.
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.