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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.