- Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- Nintendo first produced playing cards.
- The Dead Sea is actually an inland lake.
- The fastest fish in the sea is the swordfish and can reach up to speeds of 108kph (68mph, 59knots).
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