Of my own questions, I really like this one http://worldbuilding.stackexchange.com/questions/19630/is-this-concept-for-an-lta-gas-associated-element-lifecycle-feasible , I like the responses I got on it and the further thinking it and its responses provoked of me.
Regarding answers of mine I'd say this one http://worldbuilding.stackexchange.com/questions/19738/bringing-water-and-heat-to-an-isolated-mountain-village/19740#19740 is one that I'm proud of and which makes me happy. I managed to provide someone with an answer and further thoughts for their question and it even got accepted (a big…