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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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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.