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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Cyanide works by making the human body unable to use oxygen.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The horizontal fraction bar was introduced by the Arabs.