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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.