Language-learning app Duolingo makes around $500 million annually, despite offering all of its lessons for free. WSJ explores how the company is using AI and A/B testing to keep users hooked.
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Duolingo's CEO explains the move to bring employees back to the office — and why he thinks he avoided backlashFor DuoLingo's chief executive, a return-to-office mandate was key to translating fresh ideas at the language-learning app. In an interview on The Verge's "Decoder" podcast, Luis von Ahn said that ...
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