- The word laser stands for 'Light Amplification by Stimulated Emission of Radiation'.
- A whip makes a cracking sound because its tip moves faster than the speed of sound.
- The first crossword puzzle appeared in 1913.
- There are only 3 sets of letters on a keyboard which are in alphabetical order (f g h, j k l, and o p).
- The most commonly used letter in the alphabet is E.
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