Wanted: Ability to filter out already answered questions

Hi there,

I would like the ability to sort through questions that have already been answered. Take for example this page: https://www.khanacademy.org/computing/computer-programming/d
It has all the computer programming questions on it, both answered, and unanswered. I would like a button to hide all the questions that have already been answered, so that someone could just focus on the questions that haven't been answered.
Especially with the project evaluations gone, some of us that were focusing on evaluating projects might switch over to answering questions.