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  2. Puzzle contest - Wikipedia

    en.wikipedia.org/wiki/Puzzle_contest

    History. One of the earliest puzzle contests was held about 1910. The publisher of the New York Herald offered a $5 gold piece to the reader who could form the most words using the letters from the shortest verse in the Bible. More than 400 readers submitted identical solutions listing 2505 words, and the publisher was obliged to pay $5 to each ...

  3. Zazzle - Wikipedia

    en.wikipedia.org/wiki/Zazzle

    Zazzle. Zazzle is an American online marketplace that allows designers and customers to create their own products with independent manufacturers (clothing, posters, etc.), as well as use images from participating companies. Zazzle has partnered with many brands to amass a collection of digital images from companies like Disney, Warner Brothers ...

  4. Eternity puzzle - Wikipedia

    en.wikipedia.org/wiki/Eternity_puzzle

    The Eternity puzzle is a tiling puzzle created by Christopher Monckton and launched by the Ertl Company in June 1999. It was marketed as being practically unsolvable, with a £1 million prize on offer for whoever could solve it within four years. The prize was paid out in October 2000 for a winning solution arrived at by two mathematicians from ...

  5. Australian twenty-cent coin - Wikipedia

    en.wikipedia.org/wiki/Australian_twenty-cent_coin

    The twenty-cent coin of the Australian decimal currency system was issued with conversion to decimal currency on 14 February 1966, [2] replacing the florin which was worth two shillings, a tenth of a pound . To date, four different obverse face designs have been used: from 1966 to 1984, the head of Queen Elizabeth II by Arnold Machin; from 1985 ...

  6. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  7. T puzzle - Wikipedia

    en.wikipedia.org/wiki/T_puzzle

    The T-puzzle, a T shape can be assembled with the four pieces on the left. The T puzzle is a tiling puzzle consisting of four polygonal shapes which can be put together to form a capital T. The four pieces are usually one isosceles right triangle, two right trapezoids and an irregular shaped pentagon . Despite its apparent simplicity, it is a ...

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