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The horizontal fraction bar was introduced by the Arabs.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.