[Suggestion] Revision of Words You Already Know
I don't know about anybody else but I don't have the best memory in the world. I always seem to forget words that I already learned and it drives me insane trying to guess them (because I don't like to use peeks, I prefer to work it out on my own) in a lesson. I think it would be really handy if you could have an option to view all the words you already know without having to do a lesson.
Otherwise though I am really loving Duolingo and I think that the team are doing an excellent job.