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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Thyroid conditions may make getting pregnant impossible.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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Excessive alcohol use costs the country approximately $235 billion every year.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.