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The horizontal fraction bar was introduced by the Arabs.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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There are 20 feet of blood vessels in each square inch of human skin.
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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.