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  2. Flashcard - Wikipedia

    en.wikipedia.org/wiki/Flashcard

    Flashcards specifically exercise the mental process of active recall: given a question, one must produce the correct answer.However, many have raised several questions regarding optimal usage of flashcards: how does one precisely use them, how frequently does one review, and how does one react to errors, either complete failures to recall or partial mistakes?

  3. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Minor aspects of the presentation are adjustable, for example the cards can be dealt either face-up or face-down. If they are dealt face-down then the spectator must look through each of the piles until finding which one contains the selected card, whereas if they are dealt face-up then an attentive spectator can immediately answer the question of which pile contains the selected card.

  4. Mathcounts - Wikipedia

    en.wikipedia.org/wiki/Mathcounts

    In 2007, Mathcounts launched the National Math Club as a noncompetitive alternative to the Competition Series. In 2011, Mathcounts launched the Math Video Challenge Program, which was discontinued in 2023. [6] [1] 2020 was the only year since 1984 in which a national competition was not held, due to the COVID-19 pandemic.

  5. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    By using a dot to divide the digits into two groups, one can also write fractions in the positional system. For example, the base 2 numeral 10.11 denotes 1×2 1 + 0×2 0 + 1×2 −1 + 1×2 −2 = 2.75. In general, numbers in the base b system are of the form:

  6. United States government operations and exercises on ...

    en.wikipedia.org/wiki/United_States_government...

    On September 11, 2001, the North American Aerospace Defense Command (NORAD) was involved in an ongoing operation which involved deploying fighter aircraft to northeastern North America. The U.S. military and NORAD had also planned to conduct several military exercises and a drill was being held by the National Reconnaissance Office , an agency ...

  7. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

  8. Battle drill - Wikipedia

    en.wikipedia.org/wiki/Battle_drill

    A battle drill is a type of standard operating procedure used in the training of infantry. Based on commonly encountered scenarios, battle drills are used to establish standardized actions of a team, allowing for a quick collective response without the need for deliberate decision making.

  9. Linux - Wikipedia

    en.wikipedia.org/wiki/Linux

    This is an accepted version of this page This is the latest accepted revision, reviewed on 26 January 2025. Family of Unix-like operating systems This article is about the family of operating systems. For the kernel, see Linux kernel. For other uses, see Linux (disambiguation). Operating system Linux Tux the penguin, the mascot of Linux Developer Community contributors, Linus Torvalds Written ...