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  2. New York shirtwaist strike of 1909 - Wikipedia

    en.wikipedia.org/wiki/New_York_shirtwaist_strike...

    Led by Clara Lemlich and the International Ladies' Garment Workers' Union, and supported by the National Women's Trade Union League of America (NWTUL), the strike began in November 1909. In February 1910, the NWTUL settled with the factory owners, gaining improved wages, working conditions, and hours.

  3. Clara Lemlich - Wikipedia

    en.wikipedia.org/wiki/Clara_Lemlich

    Clara Lemlich Shavelson (March 28, 1886 – July 12, 1982) was a leader of the Uprising of 20,000, the massive strike of shirtwaist workers in New York's garment industry in 1909, where she spoke in Yiddish and called for action. [1]

  4. International Ladies Garment Workers Union - Wikipedia

    en.wikipedia.org/wiki/International_Ladies...

    The union also became more involved in electoral politics, in part as a result of the Triangle Shirtwaist Factory fire on March 25, 1911, in which 146 shirtwaist makers (most of them young immigrant women) either died in the fire [14] that broke out on the eighth floor of the factory, or jumped to their deaths. Many of these workers were unable ...

  5. 14 Visual Brain Teasers and Puzzles That Will Leave You ... - AOL

    www.aol.com/lifestyle/14-visual-brain-teasers...

    Triangle puzzle. Inside of a triangle are four rows and three columns, creating a 12-part grid. This puzzle is all about seeing triangles…inside triangles…inside other triangles! Your goal is ...

  6. MacMahon Squares - Wikipedia

    en.wikipedia.org/wiki/MacMahon_Squares

    Another way to change the puzzle is to restrict which colors squared make up the border colors. In the classic MacMahon squares puzzle, there are a total of 20 places on the border. [1] The number of each color that can be present on these 20 places can be described by B a,b,c [1] where a, b, and c are the number of each color of the border pieces.

  7. 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.

  8. Disentanglement puzzle - Wikipedia

    en.wikipedia.org/wiki/Disentanglement_puzzle

    Most puzzle solvers try to solve such puzzles by mechanical manipulation, but some branches of mathematics can be used to create a model of disentanglement puzzles. Applying a configuration space with a topological framework is an analytical method to gain insight into the properties and solution of some disentanglement puzzles.

  9. List of impossible puzzles - Wikipedia

    en.wikipedia.org/wiki/List_of_impossible_puzzles

    This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.