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  2. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet made its first acquisition in March 2021, with the purchase of Slader, which offered detailed explanations of textbook concepts and practice problems, and eventually incorporated it into its paid platform, Quizlet Plus. [20] [21] [22] In November 2022, Quizlet announced a new CEO, Lex Bayer, the former CEO of Starship Technologies. [23]

  3. Wigner's friend - Wikipedia

    en.wikipedia.org/wiki/Wigner's_friend

    It was therefore Everett who provided the first written discussion of the problem four or five years before it was discussed in "Remarks on the mind-body question" [1] by Wigner, of whom it received the name and fame thereafter. However, Everett being a student of Wigner's, it is clear that they must have discussed it together at some point.

  4. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The concept of an expanding universe was scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.

  5. Two-body problem in general relativity - Wikipedia

    en.wikipedia.org/wiki/Two-body_problem_in...

    The two-body problem in general relativity (or relativistic two-body problem) is the determination of the motion and gravitational field of two bodies as described by the field equations of general relativity. Solving the Kepler problem is essential to calculate the bending of light by gravity and the motion of a planet orbiting its sun.

  6. Fiscal policy - Wikipedia

    en.wikipedia.org/wiki/Fiscal_policy

    Each side of these two policies has its differences, therefore, combining aspects of both policies to deal with economic problems has become a solution that is now used by the US. These policies have limited effects; however, fiscal policy seems to have a greater effect over the long-run period, while monetary policy tends to have a short-run ...

  7. Einstellung effect - Wikipedia

    en.wikipedia.org/wiki/Einstellung_effect

    An example water jar puzzle. The water jar test, first described in Abraham S. Luchins' 1942 classic experiment, [1] is a commonly cited example of an Einstellung situation. . The experiment's participants were given the following problem: there are 3 water jars, each with the capacity to hold a different, fixed amount of water; the subject must figure out how to measure a certain amount of ...

  8. Economic expansion - Wikipedia

    en.wikipedia.org/wiki/Economic_expansion

    Economic expansion and contraction refer to the overall output of all goods and services, while the terms "inflation" and "deflation" refer to rising and falling prices of commodities, goods and services in relation to the value of money. [4] From a microeconomic standpoint, expansion usually means enlarging the scale of a single company or ...

  9. Between-group design experiment - Wikipedia

    en.wikipedia.org/wiki/Between-group_design...

    A practice effect is the outcome/performance change resulting from repeated testing. This is best described by the Power Law of Practice : If multiple levels or some other variable variation are tested repeatedly (which is the case in between-group experiments), the subjects within each sub-group become more familiarized with testing conditions ...