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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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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
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Asthma cases in Americans are about 75% higher today than they were in 1980.