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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).