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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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 horizontal fraction bar was introduced by the Arabs.
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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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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.