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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    If perfect cube ends in 8, the cube root of it must end in 2. If perfect cube ends in 9, the cube root of it must end in 9. Note that every digit corresponds to itself except for 2, 3, 7 and 8, which are just subtracted from ten to obtain the corresponding digit.

  3. Corsi–Rosenthal Box - Wikipedia

    en.wikipedia.org/wiki/Corsi–Rosenthal_Box

    The Corsi–Rosenthal Box, also called a Corsi–Rosenthal Cube or a Comparetto Cube, is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It was designed during the COVID-19 pandemic with the goal of reducing the levels of airborne viral particles in indoor settings.

  4. Krakowskie Przedmieście - Wikipedia

    en.wikipedia.org/wiki/Krakowskie_Przedmieście

    The immediate southward extension of Krakowskie Przedmieście along the Royal Route is ulica Nowy Świat (New World Street). Several other Polish cities also have streets named Krakowskie Przedmieście. In Lublin, it is the main and most elegant street. Other cities include Piotrków Trybunalski, Bochnia, Krasnystaw, Olkusz, Sieradz and Wieluń

  5. Climbing wall - Wikipedia

    en.wikipedia.org/wiki/Climbing_wall

    The grade (difficulty) of the route is usually a consensus decision between the setter of the route and the first few people who climb the route. Many indoor climbing walls have people who are assigned to set these different climbing routes. These people are called route setters or course setters. As indoor climbing walls are often used to ...

  6. Stowage plan for container ships - Wikipedia

    en.wikipedia.org/wiki/Stowage_plan_for_container...

    The most common and noted type of containers are the 20 feet and 40 feet containers. There are also containers with an extent in height called "High Cube" containers. The fixed exterior dimension of the standard size boxes are: 20 feet container size is: 20 ft (6.1 m) length by 8 ft (2.4 m) width by 8.6 ft (2.6 m) height.

  7. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    Doubling the cube is the construction, using only a straight-edge and compass, of the edge of a cube that has twice the volume of a cube with a given edge. This is impossible because the cube root of 2, though algebraic, cannot be computed from integers by addition, subtraction, multiplication, division, and taking square roots.

  8. Anagram - Wikipedia

    en.wikipedia.org/wiki/Anagram

    An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. For example, the word anagram itself can be rearranged into nag a ram, also the word binary into brainy and the word adobe into abode.

  9. Ocean liner - Wikipedia

    en.wikipedia.org/wiki/Ocean_liner

    The busiest route for liners was on the North Atlantic with ships travelling between Europe and North America. It was on this route that the fastest, largest and most advanced liners travelled, though most ocean liners historically were mid-sized vessels which served as the common carriers of passengers and freight between nations and among mother countries and their colonies and dependencies ...