Yesterday, I started looking through the unanswered questions on
the health stackexchange. There's quite a lot of them, unfortunately, but I like answering them so far. Searching pubmed and Google scholar, quoting articles, providing links, etc. So far I have written six answers, received ten upvotes for them and had one answer accepted. I was a bit nervous at first because often I can't answer every single aspect of a question, but so far nobody has had criticism. Nice.
I also have a few points on other Stackexchange sites, but nothing spectacular anywhere. Any of you on there?