- Swiss mathematician Leonhard Euler was probably the most influential mathematician of the 18th century, making discoveries in graph theory and introducing many modern mathematical words and notations among other things..
- The odds of being struck by lightning are 600,000 to 1.
- The average person goes to the toilet 6 times a day.
- The first toothbrush was invented in 1498.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
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