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Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]
The Children's Discovery System used a 16-by-48 matrix LCD screen [12] [13] and was powered by six size AA alkaline batteries. [14] The screen was much wider than it was tall, therefore only a grid of 8-by-2 text was possible, allowing for a maximum of 16 characters on-screen at any given moment.
The Leitner system for scheduling flashcards was introduced by German scientific journalist Sebastian Leitner in the 1970s with his book, So lernt man lernen. [6] Later, the SuperMemo program and algorithm (specifically the SM-2 algorithm, which is the most popular in other programs) was introduced in 1987 by Polish researcher Piotr Woźniak. [7]
The Leitner system [1] [2] [3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [ 4 ] [ 5 ] It is a simple implementation of the principle of spaced repetition , where cards are reviewed at increasing intervals.
Books A through C (for grades 2–4) introduce 300 words and books 1–9 (grades 4–12) 3,000 words, all with exercises. [1] As well as spelling and meaning, the books cover the etymology and stories behind the words discussed. [2] The series is used by home schoolers [3] and Christian educators. [4] In 2017 Wordly Wise partnered with Quizlet. [5]
A schematic of a complement fixation test. The complement fixation test is an immunological medical test that can be used to detect the presence of either specific antibody or specific antigen in a patient's serum, based on whether complement fixation occurs.
An individual person's vocabulary includes a passive vocabulary of words they can recognize or understand, as well as an active vocabulary of words they regularly use in speech and writing. [2] In semiotics , vocabulary refers to the complete set of symbols and signs in a sign system or a text, extending the definition beyond purely verbal ...
On landing in Wales at Aber Alaw in Anglesey, Branwen dies of grief [2] that so much destruction had been caused on her account, crying, Oi, a fab Duw! Gwae fi o'm genedigaeth. Da o ddwy ynys a ddiffeithwyd o'm hachos i!, "Oh Son of God, woe to me that I was born! Two fair islands have been laid waste because of me!"
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