Duolingo’s long-awaited new math app is being unveiled—in beta—at the company’s annual Duocon conference Friday. Duolingo Math, which already has a waitlist for its beta testing on iOS devices, uses ...

Yes, you read that headline correctly. Duolingo, the language learning app famous for the owl that haunts my dreams every night, now has a companion app to teach you (and children — but mostly you, ...