- The coins thrown into the Trevi fountain in Italy are collected for charity.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
- In 1872 Yellowstone in the US was the world's first national park.
- Along with arithmetic, geometry was one of the two fields of pre-modern mathematics.
- The word fortnight is a contraction of the 2 words 'fourteen nights'.
- Warthogs can reach speeds of 48km/h (29mph).
- Half of all crimes are committed by people under the age of 18.
- Hilton was the first international hotel chain.
- The strike note of the Liberty Bell is E flat.
- The word 'underground is the only word that begins and ends with the letters 'und'.
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