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The average adult has about 21 square feet of skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.