Duolingo Raises $45M, Now Valued at $470M
Since there are so many Duoling fans here, I have to ask: am I the only one who finds the app almost unusable because there's no theory?<p>For German I used to try the exercises on my commute, but suddenly the app expected me to use "dem" instead of "der" without any explanation. I can't be the only one with this problem, right? Or is there a "new concepts" tab that I've never seen?