Cmd-shift-d is the keyboard shortcut for Send in Mail.app. I have a tendency to accidentally hit that when I'm trying to lookup a word, which is ctrl-shift-d. Wait. I thought Command-Control-D was the ...

Keyboard shortcuts are a brilliant time-saver. It’s much easier to tap two or three keys at once than to go hunting through nested menus. But shortcuts depend on knowledge and muscle memory – you need ...