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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
In 1844, Charles Goodyear obtained the first patent for a rubber condom.