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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.