- Tokyo was once known as Edo.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
- The croissant was invented in Austria.
- A giraffe can clean its ears with its 21 inch tongue.
- The smallest ten prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29..
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