Viewed some documents that you'd rather not have appear in the Activities window searches? There's no menu option in Gnome 3 to clear recent history as there was in Gnome 2. In Debian, delete the following file and restart the shell.
This blog is a record of Internet security stories that have caught my attention, malware issues and computer problems that I've had to deal with or help with, and software I've discovered. It's here both to help me remember (because I'm always coming across the same issues months or years later and thinking to myself "This seems familiar"), and in the hope that it might help others.