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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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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.

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The average office desk has 400 times more bacteria on it than a toilet.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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