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  2. List of unsolved problems in geoscience - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Was there ever a collision of the Earth with another planet Theia, giving birth to the Moon? [1] There is compelling evidence, such as measures of a shorter duration of the Earth's rotation and lunar month in the past, pointing to a Moon much closer to Earth during the early stages of the Solar System.

  3. Generalized geography - Wikipedia

    en.wikipedia.org/wiki/Generalized_geography

    One may also consider playing either Geography game on an undirected graph (that is, the edges can be traversed in both directions). Fraenkel, Scheinerman, and Ullman [3] show that undirected vertex geography can be solved in polynomial time, whereas undirected edge geography is PSPACE-complete, even for planar graphs with maximum degree 3. If ...

  4. Boundary problem (spatial analysis) - Wikipedia

    en.wikipedia.org/wiki/Boundary_problem_(spatial...

    In spatial analysis, four major problems interfere with an accurate estimation of the statistical parameter: the boundary problem, scale problem, pattern problem (or spatial autocorrelation), and modifiable areal unit problem. [1] The boundary problem occurs because of the loss of neighbours in analyses that depend on the values of the neighbours.

  5. Bedlam cube - Wikipedia

    en.wikipedia.org/wiki/Bedlam_cube

    The objective is to assemble these pieces into a 4 x 4 x 4 cube. There are 19,186 distinct ways of doing so, up to rotations and reflections. The Bedlam cube is one unit per side larger than the 3 x 3 x 3 Soma cube , and is much more difficult to solve.

  6. Tales of a Fourth Grade Nothing - Wikipedia

    en.wikipedia.org/wiki/Tales_of_a_Fourth_Grade...

    Tales of a Fourth Grade Nothing is a children's novel written by American author Judy Blume and published in 1972. [1] It is the first in the Fudge series and was followed by Otherwise Known as Sheila the Great , Superfudge , Fudge-a-Mania , and Double Fudge (2002).