If you want to make a clean install of the new OS X Mavericks or even the older versions of Mac OS X, than I strongly suggest you to create a bootable OS X key or a drive.
A small group of Russian tourists climbed the guarded pyramid in the shelter of the night and took some impressive shots of the surrounding desert and outskirts of Cairo.
If you are tired and annoyed by the app requests and notifications your friends keep sending on Facebook, this is how you get rid of them without having to unfriend your friends.