In following picture you can see two links saying Unanswered. Are they both same? Whats the difference in them? When I click on them saw different results.
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The top is link to the Unanswered questions list.
The bottom is meant to sort the existing list (whatever it is) showing only unanswered questions.
Just rephrasing the other answers. :)
The top one is for all unanswered questions.
The bottom one is for all unanswered questions in your current context. So if you're viewing a tag, it will show you the unanswered questions for that tag.