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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.