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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.