Duolingo's strong user base and brand make it a top AI-driven language app. Read here for an analysis of DUOL stock and see if it fits your portfolio.

After my Duolingo app switched to the new energy system, I see why the change has been so controversial among users.

Recently, Duolingo has switched from its hearts system to an energy system, where every lesson costs a bit of energy. Energy slowly refills over time or instantly refills by watching a rewarded ad.

Luis von Ahn echoes research and the Apple founder's mantra when he says changing your mindset around luck can make you more successful.