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  2. IKEA Billy - Wikipedia

    en.wikipedia.org/wiki/IKEA_Billy

    In 2009 Bloomberg instigated a "Billy bookcase index", as an alternative to the Big Mac index, to compare relative price levels in different countries around the world. [8] [9] From 2011 to 2014 Billy was available as a 40 cm deep variant alongside the standard 28 cm deep versions. [10] In 2014, reinforced shelves and rounded edges were ...

  3. Block-stacking problem - Wikipedia

    en.wikipedia.org/wiki/Block-stacking_problem

    The first nine blocks in the solution to the single-wide block-stacking problem with the overhangs indicated. In statics, the block-stacking problem (sometimes known as The Leaning Tower of Lire (Johnson 1955), also the book-stacking problem, or a number of other similar terms) is a puzzle concerning the stacking of blocks at the edge of a table.

  4. Bookcase - Wikipedia

    en.wikipedia.org/wiki/Bookcase

    A bookcase, or bookshelf, is a piece of furniture with horizontal shelves, often in a cabinet, used to store books or other printed materials. Bookcases are used in private homes, public and university libraries, offices, schools, and bookstores. Bookcases range from small, low models the height of a table to high models reaching up to ceiling ...

  5. Hypercube - Wikipedia

    en.wikipedia.org/wiki/Hypercube

    In geometry, a hypercube is an n-dimensional analogue of a square (n = 2) and a cube (n = 3); the special case for n = 4 is known as a tesseract.It is a closed, compact, convex figure whose 1-skeleton consists of groups of opposite parallel line segments aligned in each of the space's dimensions, perpendicular to each other and of the same length.

  6. Tesseract - Wikipedia

    en.wikipedia.org/wiki/Tesseract

    The characteristic 5-cell of the 4-cube is a fundamental region of the tesseract's defining symmetry group, the group which generates the B 4 polytopes. The tesseract's characteristic simplex directly generates the tesseract through the actions of the group, by reflecting itself in its own bounding facets (its mirror walls ).

  7. List of world records in speedcubing - Wikipedia

    en.wikipedia.org/wiki/List_of_world_records_in...

    For most events, an average of five is taken, but for 6×6×6, 7×7×7, 3×3×3 blindfolded, 3×3×3 fewest moves, 4×4×4 blindfolded and 5×5×5 blindfolded, an average of three is taken. For averages of five solves, the best time and the worst time are dropped, and the mean of the remaining three solves is taken.

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