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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.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Asthma cases in Americans are about 75% higher today than they were in 1980.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.