- The makers of the board game Monopoly print over 50 billion dollars worth of Monopoly money every year.
- The human eye can detect more shades of green that any other colour.
- In 1872 Yellowstone in the US was the world's first national park.
- The most sung song is happy birthday.
- The fastest fish in the sea is the swordfish and can reach up to speeds of 108kph (68mph, 59knots).
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