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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.