Duolingo stock plunges despite a blowout quarter -- what gives?Shares of Duolingo (DUOL -17.85%) took a dive like a wounded green owl on Thursday. The language-learning expert posted strong first-quarter results on Wednesday evening, but some investors wanted a stronger user-growth story, and others simply cashed in some paper profits.The stock fell as much as 21.4% just after the opening bell today, firming up at a 17% price drop around 2 p.m. ET.Duolingo's blowout resultsIn the first quarter of 2024, Duol ...