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The folding pattern for this form was documented by Isao Honda in 1933 alongside the simple cube. It was also documented by Harry Houdini as a "Japanese hexagon puzzle box" in 1922 without the simple cube version, in the company of several other traditional models which he learned from a Japanese acquaintance. Like the cube, this form can also ...
The test was developed in 1920 by psychologist Samuel C. Kohs (1890–1984), a student of Lewis Terman, [3] building on earlier and similar designs (such as Francis N. Maxfield's Color Cube Test). [4] Kohs described the 1920s version of the test as a series of 17 cards which increase in complexity as the test progressed. [5]
It appears again, with the salt cellar name, in several other publications in the 1880s and 1890s in New York and Europe. Mitchell also cites a 1907 Spanish publication describing a guessing game similar to the use of paper fortune tellers. [20] The use of this shape as a paper fortune-teller in England has been recorded since the 1950s. [21]
The method he used is called IDA* and is described in his paper "Finding Optimal Solutions to Rubik's Cube Using Pattern Databases". [15] Korf describes this method as follows IDA* is a depth-first search that looks for increasingly longer solutions in a series of iterations, using a lower-bound heuristic to prune branches once a lower bound on ...
The construction of origami models is sometimes shown as crease patterns. The major question about such crease patterns is whether a given crease pattern can be folded to a flat model, and if so, how to fold them; this is an NP-complete problem. [32] Related problems when the creases are orthogonal are called map folding problems.
The Rubik's Cube is a 3D combination puzzle invented in 1974 [2] [3] by Hungarian sculptor and professor of architecture Ernő Rubik. Originally called the Magic Cube, [4] the puzzle was licensed by Rubik to be sold by Pentangle Puzzles in the UK in 1978, [5] and then by Ideal Toy Corp in 1980 [6] via businessman Tibor Laczi and Seven Towns ...
Modular origami or unit origami is a multi-stage paper folding technique in which several, or sometimes many, sheets of paper are first folded into individual modules or units and then assembled into an integrated flat shape or three-dimensional structure, usually by inserting flaps into pockets created by the folding process. [3]
Middle grade literature is literature intended for children between the ages of 8 and 12. While these books are sometimes grouped together with books for other age bands and collectively called "children's books", middle grade is distinct from picture books , early or easy readers, and chapter books , all of which are intended for younger ...