I've noted an interesting difference between the two filters on the main page.
The main set of filters on the same level as the Genealogy and Family History header are: Questions Tags Users Badges Unanswered Ask Question
Underneath that, if you are viewing the list of questions on the main page, across from where it says All Questions the choices are: newest frequent votes active unanswered
If you choose "unanswered" from the selections on the banner, you get a list of questions where the number of answers = 0.
If you choose "unanswered" from the "all questions" row, the top result is a question with an answer (disclaimer: answered by me, but I'm not fishing for upvotes here):
Is this a feature, or a bug? Does the question still rate as 'unanswered' on the main page because the only answer so far has zero upvotes?