The language-learning app Duolingo announced on Tuesday that its make-believe mascot, Duo the Owl, mysteriously died and a cause of death has not been determined. "It is with great sorrow that we ...

A moment of silence for Duo, the Duolingo owl. The language-learning app Duolingo announced Tuesday that its iconic, chaotic and unhinged mascot Duo Keyshauna Renee Lingo — more commonly known ...