Every other week we publish the most difficult questions you asked us at MakeUseOf Answers.

The good news is that during the past two weeks no question went unanswered. Nevertheless, some problems have not yet been resolved. Maybe you can help? Please have a look at our 5 toughest questions this week:

1. Can you help me with an OpenCV problem?
2. Why does MySQL not start on boot of Ubuntu?
3. Where can I get free certificates for studying programming languages online?
4. How can I rescue an NTFS-formatted SDHC card?
5. How can I find all the websites that I have joined?

Would you like to browse other popular questions or see which questions we weren’t able to answer? You can switch back and forth between latest, unanswered, and most popular questions using the respective buttons at MakeUseOf Answers. You can also follow Answers via RSS.

And if you have a question of your own, don’t hesitate to ask! No sign up or registration is required.

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