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  2. International English Language Testing System - Wikipedia

    en.wikipedia.org/wiki/International_English...

    Website. ielts.org. International English Language Testing System (IELTS / ˈaɪ.ɛlts /) [ 6 ] is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council, IDP and Cambridge English, [ 6 ] and was established in 1989.

  3. List of most-viewed YouTube videos - Wikipedia

    en.wikipedia.org/wiki/List_of_most-viewed...

    Specifically, to count as a legitimate view, a user must intentionally initiate the playback of the video and play at least 30 seconds of the video (or the entire video for shorter videos). Additionally, while replays count as views, there is a limit of 4 or 5 views per IP address during a 24-hour period, after which point, no further views ...

  4. Test of English as a Foreign Language - Wikipedia

    en.wikipedia.org/wiki/Test_of_English_as_a...

    In the past this test lasted 4 hours, today people can choose to take the test for around 3 hours. The test consists of four sections, each measuring one of the basic language skills (while some tasks require integrating multiple skills), and all tasks focus on the language used in an academic, higher-education environment.

  5. 2,147,483,647 - Wikipedia

    en.wikipedia.org/wiki/2,147,483,647

    The number 2,147,483,647 is the eighth Mersenne prime, equal to 2 31 − 1. It is one of only four known double Mersenne primes. [ 1 ] The primality of this number was proven by Leonhard Euler, who reported the proof in a letter to Daniel Bernoulli written in 1772. [ 2 ] Euler used trial division, improving on Pietro Cataldi 's method, so that ...

  6. The 4-Hour Workweek - Wikipedia

    en.wikipedia.org/wiki/The_4-Hour_Workweek

    The 4-Hour Workweek. The 4-Hour Workweek: Escape 9–5, Live Anywhere, and Join the New Rich (2007) is a self-help book by Timothy Ferriss, an American writer, educational activist, and entrepreneur. [ 1 ] It deals with what Ferriss refers to as "lifestyle design", and repudiates the traditional "deferred" life plan in which people work ...

  7. Maximal and minimal elements - Wikipedia

    en.wikipedia.org/wiki/Maximal_and_minimal_elements

    The red subset = {1,2,3,4} has two maximal elements, viz. 3 and 4, and one minimal element, viz. 1, which is also its least element. In mathematics , especially in order theory , a maximal element of a subset S {\displaystyle S} of some preordered set is an element of S {\displaystyle S} that is not smaller than any other element in S ...

  8. Medical resident work hours - Wikipedia

    en.wikipedia.org/wiki/Medical_resident_work_hours

    As per the rules of the Accreditation Council for Graduate Medical Educationin the United States of America, residents are allowed to work a maximum of 80 hours a week averaged over a 4-week period. Residents work 40–80 hours a week depending on specialty and rotation within the specialty,[citation needed]with residents occasionally logging ...

  9. VO2 max - Wikipedia

    en.wikipedia.org/wiki/VO2_max

    V̇O 2 max (also maximal oxygen consumption, maximal oxygen uptake or maximal aerobic capacity) is the maximum rate of oxygen consumption attainable during physical exertion. [1] [2] The name is derived from three abbreviations: "V̇" for volume (the dot over the V indicates "per unit of time" in Newton's notation), "O 2" for oxygen, and "max" for maximum and usually normalized per kilogram of ...