How a bot-fighting test turned into edtech’s most iconic brand, Duolingo

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Luis von Ahn, an entrepreneur who has dedicated his career to scaling free education, has probably annoyed you more than once. In fact, you’ve likely been annoyed by his work dozens and maybe hundreds of times over the years. A decade before he co-founded the whimsical and language-learning app Duolingo, one of the most popular education apps in the world…
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