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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.