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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.
There are more bacteria in your mouth than there are people in the world.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

