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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 women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%