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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.