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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.
Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.