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  2. Investigations in Numbers, Data, and Space - Wikipedia

    en.wikipedia.org/wiki/Investigations_in_Numbers...

    Although negative numbers are not taught in the 2nd grade, "constructivist" student subtracting 9 from 28 explains that "8 minus 9 equals negative 1" and then argues that "-1 plus 20 is the same as 20-1 and equals 19." [3] On the basis of this, and of the average score of this group of 10 students, the author concluded that "although they did ...

  3. 3rd Test and Evaluation Squadron - Wikipedia

    en.wikipedia.org/wiki/3rd_Test_and_Evaluation...

    The 3rd Test and Evaluation Squadron (3 TES) (formerly 3rd Space Experimentation Squadron (3 SES)) is a space test and evaluation unit located at Schriever Space Force Base in Colorado. As part of the United States Air Force , the squadron was described, in 2008, as "AFSPC's premier organization for space-based demonstrations, pathfinders and ...

  4. Spaced learning - Wikipedia

    en.wikipedia.org/wiki/Spaced_learning

    Spaced retrieval practice – trying to recover long-term memories quickly and accurately – is the subject of a different line of research but also shows that spaced practice (for example, taking a practice test every month) is more effective than massed practice. The significance of Spaced Learning may prove important in different ways:

  5. Configuration space (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Configuration_space...

    The configuration space of all unordered pairs of points on the circle is the Möbius strip. In mathematics, a configuration space is a construction closely related to state spaces or phase spaces in physics. In physics, these are used to describe the state of a whole system as a single point in a high-dimensional space.

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  7. 3rd Space Operations Squadron - Wikipedia

    en.wikipedia.org/wiki/3rd_Space_Operations_Squadron

    The squadron was first activated at Maxwell Field, Alabama as the 3rd Photographic Squadron under the 1st Photographic Group in May 1941. [2] It performed aerial mapping primarily over the southeastern United States prior to the Pearl Harbor Attack using Bell P-39 Airacobra sub-variants (F-2) which were equipped for the ground-attack and reconnaissance roles.

  8. Third Space Theory - Wikipedia

    en.wikipedia.org/wiki/Third_Space_Theory

    Another contemporary construction of three "spaces" is that one space is the domestic sphere: the family and the home; [11] a second space is the sphere of civic engagement including school, work and other forms of public participation; and set against these is a Third Space where individual, sometimes professional, [12] [13] and sometimes ...

  9. Spacetime diagram - Wikipedia

    en.wikipedia.org/wiki/Spacetime_diagram

    Fig 13. In Newtonian physics for both observers the event at A is assigned to the same point in time. The black axes labelled x and ct on Fig 1-3 are the coordinate system of an observer, referred to as at rest, and who is positioned at x = 0. This observer's world line is identical with the ct time axis. Each parallel line to this axis ...