I got my Danish Duolingo tree fully gold again meaning I am at full strength (not an easy task as the various subjects turn back to their normal colour one by one, every few hours). I also got on top of the housework and have kept at it for about a month now. I have never managed to for this long before.
I didn't know what this was.
https://en.wikipedia.org/wiki/Duolingo
http://duolingo.wikia.com/wiki/Language_Tree
https://en.duolingo.com/