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  2. Construction puzzle - Wikipedia

    en.wikipedia.org/wiki/Construction_puzzle

    A construction puzzle is a puzzle where players have to build (assemble) a technical contraption. This may be a static object (such as a bridge) or a mechanical ...

  3. Constructionism (learning theory) - Wikipedia

    en.wikipedia.org/wiki/Constructionism_(learning...

    Papert's ideas became well known through the publication of his seminal book Mindstorms: Children, Computers, and Powerful Ideas (Basic Books, 1980). Papert described children creating programs in the Logo educational programming language. He likened their learning to living in a "mathland" where learning mathematical ideas is as natural as ...

  4. Glossary of construction cost estimating - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_construction...

    Man-hour rate = man-hours required for work / completed work quantity. Example: Excavation 0.125 mh/cy. The man-hour rate is related to the inverse of the production rate times the number of workers in the crew performing the work. Example: Excavation at 8 cy/day (8-hour day) with 2-man crew = 2 x 8 / 8 = 2 man-hours/cy. See also Production rate.

  5. Construction of One World Trade Center - Wikipedia

    en.wikipedia.org/wiki/Construction_of_One_World...

    The fifth floor was finished on January 16. In February, construction began on the sixth floor, the last floor of 1 WTC's base, and the Port Authority announced that the tower's steel superstructure had reached 200 feet (61 m) above street level. [29] By the end of March 2010, steel beams began to be erected for the second office floor.

  6. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    A single concrete block, as used for construction. Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. . Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material

  7. Unbuilt plans for the Second Avenue Subway - Wikipedia

    en.wikipedia.org/wiki/Unbuilt_plans_for_the...

    The first segment of the 63rd Street Lines, which opened on October 29, 1989, included provisions for future connections to the Second Avenue Line. When the construction of the Second Avenue Subway finally commenced in the 21st century, the Lexington Avenue Line was by far the busiest subway line in the United States, with an estimated 1.3 ...

  8. Second grade - Wikipedia

    en.wikipedia.org/wiki/Second_grade

    In Ireland, the equivalent to second grade is known as "Second Class" (usually for 7–8 year olds), which is year 4 of primary school.It is traditionally the year that is dedicated to preparing for the child's "First Holy Communion"; however, as Ireland has become increasingly multicultural, more and more schools are opting to prepare for the sacrament outside of school hours.

  9. JumpStart 2nd Grade - Wikipedia

    en.wikipedia.org/wiki/JumpStart_2nd_Grade

    JumpStart 2nd Grade (known as Jump Ahead Year 2 in the United Kingdom) is a video game released on 26 March 1996 by Knowledge Adventure. As its name suggests, it was made to teach second grade students.

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