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The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air, is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.
Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's puzzle was a four-by-four grid with no shaded squares; it included horizontal and vertical clues. [33]
Memorable Events/Puzzles: Puzzles were given in three waves, with the puzzles in wave three having the same names as those in the first two waves, but a slightly different puzzle in keeping with the idea that the villain went back and changed time. Chicago Fire, a crossword puzzle on red construction paper, was a memorable puzzle in that it ...
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The abbreviation is not always a short form of the word used in the clue. For example: "Knight" for N (the symbol used in chess notation) Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE.
When an extended phrase of the answer can also be used in the clue to mutual meaning, the mutual extension is indicated in parentheses. e.g., [Think (over)] for MULL, [Drive (away)] for PUSH. When the answer can use an additional word to fit the clue, the word is preceded by "with" and placed in quotes. e.g., [Understand, with "in"] for SINK.
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