I LOVE DUO
post here you're love and thanks to duo and the staff who made it possible!
Good to know. I am sure this is the idea that Luis von Ahn and Severin Hacker wanted learners to feel when they started this company. Quite a challenge too. A interesting podcast on NPR talks about this company's starup. https://www.npr.org/2020/05/22/860884062/recaptcha-and-duolingo-luis-von-ahn They don't start talking about Duo until the end, but still, very intriguing.