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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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.