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The horizontal fraction bar was introduced by the Arabs.
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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 heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.