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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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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 first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Cyanide works by making the human body unable to use oxygen.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.