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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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Thyroid conditions may make getting pregnant impossible.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.