- Italian mathematician Leonardo of Pisa (better known as Fibonacci) lived between the years 1170 and 1250 and is best known today for Fibonacci numbers, the number sequence named after him. Fibonacci introduced the number sequence to Western Europe in his book 'Liber Abaci' after they had been described earlier by Indian mathematicians..
- Some dinosaurs had tails over 13m (45 feet) long.
- Months that start on a Sunday will always have a Friday the 13th.
- African Grey Parrots have vocabularies of over 200 words.
- There are 132 rooms in the US White House.
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