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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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