> **Possible Duplicate:**  
> [Windows-7 -tagged questions are highlighted light blue](http://meta.superuser.com/questions/3728/windows-7-tagged-questions-are-highlighted-light-blue)  

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As in the picture shown, **why some question are highlighted ?**

![enter image description here][1]


  [1]: https://i.sstatic.net/er7Nq.png