- Hippopotamuses have skin 3.8cm (1.5in) thick.
- The Moons diameter is 3,476km.
- Dogs can make about 10 sounds, while cats make about 100.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- A pumpkin really is a fruit.
- Adults laugh only about 15 to 100 times a day, while preschoolers laugh an average of 300 times a day.
- 32% of all land in the U.S. is owned by the government.
- The fastest fish in the sea is the swordfish and can reach up to speeds of 108kph (68mph, 59knots).
- Tiger Woods' real first name is Eldrick.
- The word 'almost' is the longest in the English language with all the letters in alphabetical order.
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