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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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There are approximately 3 million unintended pregnancies in the United States each year.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.