- The golden ratio of approximately 1.618 between two quantities such as lengths often appears in nature (tree branching, uncurling ferns, pine cone arrangements etc) and has been used throughout history to create aesthetically pleasing designs and art works such as Leonardo da Vinci's Mona Lisa..
- Flushable toilets were in use in ancient Rome.
- A woodpecker can peck 20 times a second.
- Jack is the most common name in nursery rhymes.
- Jamaica has 120 rivers.
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