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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The average adult has about 21 square feet of skin.