Practicing with a native speaker has long been seen as the best way to learn a language, but Duolingo thinks its AI characters can fill in if you don't have a global contact list. The language ...

Learning a new language can be hard, but it’s extremely exciting. Spanish is one of the world’s most spoken languages, and it’s likely you already know a little Spanish or are familiar with ...

But if I could wave a magic wand, she’d know more of them — and fewer words for, say, “milk,” “sisters” and “shoes.” More important, Duolingo hasn’t yet taught her how Spanish ...