Well, there are the Millennium Prize problems:
Solving any one of those is worth a million dollars. Literally, that is; there's a prize for doing it.
When on the category home page (not the category topic page) you should see all the answered questions. To get to the unanswered questions in the category there is a link to unanswered questions above the name of the category. If you are not seeing a list of questions you probably are looking at the topic page instead of the category homepage and will need to use the browse categories page to get to the category homepage instead.
Answered and Unanswered questions on Geophysics can be found at the following URL:http://wiki.answers.com/Q/FAQ/3457
Simply unanswered questions about Poptropica.
YES, there are unanswered questions on Stardoll.
search "unanswered questions"
because they are looking for the best answers to the questions that are unanswered...
Here is the link to the unanswered questions about the Oscars:Special:UnAnsweredQ
Questions with only an Expert answer are treated as Unanswered. A mistaken policy according to some.
The majority of questions on WikiAnswers are actually unanswered.
Unanswered questions about Spain can be found at this link:Special:UnAnsweredQ
Scroll down the page until you see "Unanswered questions". It's on the right side at the bottom of the page.You can do the same on another page, for example the Science page has "Unanswered questions" at the bottom, for science questions only.
Answer them.