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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.