panonood
Is Duolingo Useful?
Fluent in German with Duolingo
I did Duolingo's hidden language (Catalan)... but it's a speedrun
Time It Takes To Learn Languages | Comparison
Japanese Guy Tries Duolingo Japanese
Duolingo for Talking to Children - SNL
Learning POLISH as fast as my brain can handle | Duolingo Speedrun #23
looks like you missed your spanish lesson today