The No Answers section of the unanswered tab seems to have a lot of questions where people are trying to figure out how to perform a certain action in a given webapp. If this can't be done, and there's no easy workaround, the question often sits unanswered. Generally no one will be certain enough of a site to give a definitive answer of "sorry, that's not possible".
288/3015 questions are unanswered, almost 10%, which seems high.
Picking the first two sites randomly from the dropdown in the upper left:
Photography has 3/1220 with no answers
Home improvement is still in beta, has 9/981 unanswered.
Area 51 says that a site needs 90% of questions answered with upvotes to be healthy. Webapps has 10% with no answers, period. This can potentially discourage new users who come to the site and get silence in response to their question.
Is there anything which can be done about this? Is this just the nature of the beast?