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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. 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 ...

  7. Test of English as a Foreign Language - Wikipedia

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

    Test of English as a Foreign Language ( TOEFL / ˈtoʊfəl / TOH-fəl) is a standardized test to measure the English language ability of non-native speakers wishing to enroll in English-speaking universities. The test is accepted by more than 11,000 universities and other institutions in over 190 countries and territories.

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