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  2. 25 Printable Brain Teasers You Can Print for Free - AOL

    www.aol.com/25-printable-brain-teasers-print...

    How many of these brain busters can you solve? The post 25 Printable Brain Teasers You Can Print for Free appeared first on Reader's Digest.

  3. Play free online Puzzle games and chat with others in real-time and with NO downloads and NOTHING to install. ... Crossword. Play. Masque Publishing. ... Spangram and Answers for Friday, February 14.

  4. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    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 ...

  5. Underwater firearm - Wikipedia

    en.wikipedia.org/wiki/Underwater_firearm

    After entering the water, the bullet will continue its original trajectory. The user, when aiming the gun, needs to compensate for the refractive index of the water (roughly 1.333 for fresh water at 20 °C (68 °F)). [2] MEA series supercavitating ammunition is currently available in the following calibers: [2]

  6. Bridge and torch problem - Wikipedia

    en.wikipedia.org/wiki/Bridge_and_torch_problem

    The puzzle is known to have appeared as early as 1981, in the book Super Strategies For Puzzles and Games. In this version of the puzzle, A, B, C and D take 5, 10, 20, and 25 minutes, respectively, to cross, and the time limit is 60 minutes. [6] [7] In all these variations, the structure and solution of the puzzle remain the same.

  7. Cryptic crossword - Wikipedia

    en.wikipedia.org/wiki/Cryptic_crossword

    A 15x15 lattice-style grid is common for cryptic crosswords. A cryptic crossword is a crossword puzzle in which each clue is a word puzzle. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, [1] as well as Ireland, the Netherlands, and in several Commonwealth nations, including Australia, Canada, India, Kenya, Malta, New Zealand, and South Africa.

  8. Induction puzzles - Wikipedia

    en.wikipedia.org/wiki/Induction_puzzles

    The muddy children puzzle is the most frequently appearing induction puzzle in scientific literature on epistemic logic. [4] [5] [6] Muddy children puzzle is a variant of the well known wise men or cheating wives/husbands puzzles. [7] Hat puzzles are induction puzzle variations that date back to as early as 1961. [8]

  9. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Country codes; e.g., "Switzerland" can indicate the letters CH; ICAO spelling alphabet: where Mike signifies M and Romeo R; Conventional abbreviations for US cities and states: for example, "New York" can indicate NY and "California" CA or CAL. The abbreviation is not always a short form of the word used in the clue. For example: