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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The average office desk has 400 times more bacteria on it than a toilet.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.