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.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The carbon cycle. Numbers are storage as 1015 g or fluxes as 1015 g per year (data from Schlesinger
Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b
American Foreign Trade, 1790–1812
Two language centers of the brain
Angry jeers from whites rain down on Elizabeth Eckford, one of the first African American students ...