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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.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

A page from Kelileh o Demneh dated 1429, from Herat, a Persian translation of the ancient Indian Pan A page from Kelileh o Demneh dated 1429, from Herat, a Persian translation of the ancient Indian Pan
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Nutrition-related research findings are often lead stories in newspapers, magazines, and on websites Nutrition-related research findings are often lead stories in newspapers, magazines, and on websites
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