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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The horizontal fraction bar was introduced by the Arabs.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.