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How to cook a puzzle, or mathematical one-uppery 1966 Jun: The persistence (and futility) of efforts to trisect the angle: 1966 Jul: Freud's friend Wilhelm Fliess and his theory of male and female life cycles 1966 Aug: Puzzles that can be solved by reasoning based on elementary physical principles 1966 Sep: The problem of Mrs. Perkins' quilt ...
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.
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Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [31] 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 ...
He was drawn to puzzles at an early age; in eighth grade he wrote a paper titled "Puzzles as a Profession". [4] (The paper earned him a B+.) [4] At age 13, Shortz wrote to Language on Vacation author Dmitri Borgmann for advice on how to pursue a career in puzzles. [5] At age 16, Shortz began regularly contributing crossword puzzles to Dell ...
The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons. A cation is a positively charged ion with fewer electrons than protons [2] (e.g. K + (potassium ion)) while an anion is a negatively charged ion with more electrons than protons. [3] (e.g. Cl − (chloride ion) and OH − ...
The largest puzzle (40,320 pieces) is made by a German game company Ravensburger. [8] The smallest puzzle ever made was created at LaserZentrum Hannover. It is only five square millimeters, the size of a sand grain. The puzzles that were first documented are riddles. In Europe, Greek mythology produced riddles like the riddle of the Sphinx ...
While the full extent of his scientific studies has only become recognized in the last 150 years, during his lifetime he was employed for his engineering and skill of invention. Many of his designs, such as the movable dikes to protect Venice from invasion, proved too costly or impractical. Some of his smaller inventions entered the world of ...
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