Everyone who’s trying to learn a new language these past few years is almost certainly using the Duolingo app. You probably have at least one friend who’s kind of annoying about it. It’s so popular, ...

Pittsburgh-based company Duolingo is hoping to strike a chord with customers. The language-learning app is introducing a music course. It teaches music literacy, including reading notes and playing ...

A few weeks before flying to Lisbon for vacation earlier this year, I redownloaded Duolingo. I'd used the language-learning app off and on over the years to brush up on my high-school French, but life ...