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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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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.