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  2. Luis von Ahn - Wikipedia

    en.wikipedia.org/wiki/Luis_von_Ahn

    Duolingo logo. In 2009, von Ahn and his graduate student Severin Hacker began to develop Duolingo, a language education platform. They founded a company of the same name, with von Ahn as chief executive officer and Hacker as chief technology officer. In November 2011, a private beta test of Duolingo was launched and the app was released to the ...

  3. Duolingo - Wikipedia

    en.wikipedia.org/wiki/Duolingo

    Duolingo, Inc.[ b] is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on music, [ 5] math, [ 6] and 43 languages, [ 7] ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo. [ 8]

  4. Severin Hacker - Wikipedia

    en.wikipedia.org/wiki/Severin_Hacker

    Carnegie Mellon University ( PhD) Known for. Duolingo. Scientific career. Institutions. Carnegie Mellon University, ETH Zurich. Doctoral advisor. Luis von Ahn. Severin Hacker (born July 6, 1984) is a Swiss computer scientist who is the co-founder and CTO of Duolingo, the world's most popular language-learning platform.

  5. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  6. 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.

  7. Duolingo English Test - Wikipedia

    en.wikipedia.org/wiki/Duolingo_English_Test

    The Duolingo English Test ( DET) is a standardized test of the English language designed to be internet-based rather than paper-based. DET is an adaptive test that uses an algorithm to adapt the difficulty of the test to the test-taker. [ 1][ 2][ 3] It was developed by Duolingo in 2014 as Test Center [ 4] and grew in popularity and acceptance ...

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