- The term 'disc jockey' was first used in 1937.
- The expression to 'knuckle down' originated from playing marbles (players used to put their knuckles to the ground for their best shots).
- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal..
- There are no rivers in Saudi Arabia.
- The most popular snack food is potato chips.
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