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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 500,000 babies are born each year in the United States to teenage mothers.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.