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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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In 1864, the first barbiturate (barbituric acid) was synthesized.