The feeling when you lose your last heart on the last question.
I know it has happened to us all before!
After every group of lessons, I go back to the beginning and go over them all again. If you have ever done that you discover that Duo will sometimes shoot some pretty obscure words at you that are far beyond whatever level you are in. In those cases I will look.
Other cases are where I know what the words mean but I remember it is an idiomatic expression that doesn't even work very well in English. Again, I have no hesitation.
Sometimes I type in a guess on Google Translate to see if it sounds close to what the duo robot is saying. I have a real problem with Duo chien and chat.
Redoing the whole lesson which otherwise is really basic is pointless and slows me down from getting to new material. I say redoing because I won't move on until I keep all hearts.
It's incredibly frustrating, but even more so when the last question is an audio question. I'm learning Italian right now, and unfortunately the Italian voice needs a lot of work. There are times I get it wrong simply because I have no idea what is being said, and I use headphones to make it clearer! I really hope the staff fixes that soon...
Well, since I'm not doing Italian, I don't know how bad the voice really is. If it's really bad quality in general, you can always go to http://www.duolingo.com/settings/account and turn off all the audio questions. If you just have problems every now and then, I wouldn't switch them off though, because listening and speaking is an important part of learning a language.
They're something knew coming up on Duolingo. From a gaming perspective, think of them as gold coins. You collect them by leveling up, completing a lesson without mistakes, etc., and then spend them in the Duolingo "shop." Word is that one of the things you can buy is an additional heart, although I don't know whether it's one lesson only or if it carries over if you don't use it. It'll make for a nice safety net.
Anyway, lingots are in testing right now, 25% of users are beta testing them now. Hopefully the rest of us will get them soon.